Kitchen appliance

Abstract

The present disclosure provides a kitchen appliance including a vessel (104) for containing a substance (108), wherein the vessel (104) includes a light pipe (110) that extends from a bottom portion of the vessel (104) along a portion of one or more side walls (116) of the vessel (104), and a base (106) configured to removably support the vessel (104), wherein the base (106) includes an illumination assembly (250). When the vessel (104) is supported by the base (106), the light pipe (110) is positioned adjacent to the illumination assembly (250) to receive and transmit light emitted therefrom.

Description

KITCHEN APPLIANCERELATED APPLICATIONS

[0001] The present application claims priority to Australian Provisional Application No. 202490407, filed 9 December 2025, the contents of which is incorporated by reference in its entirety.TECHNICAL FIELD

[0002] The present invention relates to a kitchen appliance.BACKGROUND

[0003] Various problems exist with kitchen appliances that contain substances for producing a beverage.

[0004] In some kitchen appliances it can be difficult to see the amount of substance that is stored therein. In relation to kettles, a user may refill the kettle with excessive amounts of water for boiling which may not be required. Whilst some cordless kettles including electrical lighting in the vessel to illuminate the contents therein whilst placed on a charging base, once the vessel has been removed from the base, the lighting is stopped, thereby making it difficult for the user to see the amount of water contained in the vessel. Furthermore, operation of kettles can lead to a build-up of scale within the vessel. Users may want to clean the scale from the kettle and may consider immersing the kettle in hot water including a cleaning solution, placing the kettle in a dishwasher, or the like. However, electrical lighting and associated electronics that are used to illuminate the substance contained within the kettle could be damaged or compromised when immersed in water and / or exposed to high temperatures. Elimination of lighting to provide a dishwasher safe kettle is not a preferred option as the lighting can be used to communicate particular information to the user about the appliance, such as when the kettle has completed boiling, the current temperature of thekettle, or the like. Furthermore, elimination of lighting is not a preferred option as it can be used to make the kitchen appliance more aesthetically pleasing to the end user.

[0005] In another kitchen appliance, a hopper for a coffee bean grinder or espresso machine can have stored therein coffee beans which are generally stored in a non-sealed environment. Users may store excessive amounts of coffee beans in the hopper because it can be difficult to see the amount of coffee beans contained within the hopper due to dust that can collect on the inside surface of the hopper walls. Whilst lighting assemblies can be mounted to the kitchen appliance to enable the amount of substance stored therein to be determined by the user, the user will still want to clean the hopper to avoid a stale taste building up in the espresso produced. However, if the user were to immerse the hopper having electrical lighting into water, the electrical lighting may corrode or malfunction over time due to the exposure to water.SUMMARY

[0006] The present invention seeks to ameliorate one or more of the above-mentioned problems or provide a useful alternative.

[0007] In one aspect there is provided a kitchen appliance including: a vessel for containing a substance, wherein the vessel includes a light pipe that extends from a bottom portion of the vessel along a portion of one or more side walls of the vessel; and a base configured to removably support the vessel, wherein the base includes an illumination assembly; wherein when the vessel is supported by the base, the light pipe is positioned adjacent to the illumination assembly to receive and transmit light emitted therefrom.

[0008] In one or more embodiments, the light pipe includes one or more ribs, wherein each rib has an elbow profile.

[0009] In one or more embodiments, the elbow profile of each rib is configured to redirect light received in a first direction substantially orthogonal to a central axis of the base into a second direction substantially parallel to the central axis to illuminate the side walls along their length.

[0010] In one or more embodiments, each rib includes a first portion extending substantially orthogonal to the central axis of the base, and a second portion extending toward an opening of the vessel, wherein at least some of the light received via the first portion is internally reflected along a path which is substantially parallel with an inner surface of the second portion which faces the bottom portion of the vessel.

[0011] In one or more embodiments, the light pipe includes an annular structure which the one or more ribs extend therefrom, wherein the light emitted from the illumination assembly is received by the annular structure which then transfers the light to the one or more ribs.

[0012] In one or more embodiments, the annular structure and ribs are configured to distribute light circumferentially around the vessel to provide uniform illumination of the substance.

[0013] In one or more embodiments, the one or more ribs are arranged in a radial pattern around a central axis of the vessel.

[0014] In one or more embodiments, the illumination assembly is a strip of light emitting diodes.

[0015] In one or more embodiments, at least a light emitting portion of the illumination assembly is mounted at or adjacent to a support surface of the base.

[0016] In one or more embodiments, the light emitting portion is mounted to emit light substantially orthogonal to a central axis of the base.

[0017] In one or more embodiments, the kitchen appliance is a kettle appliance.

[0018] In one or more embodiments, the base is electrically connectable to an electrical power source, wherein the base includes a base electrical engaging portion which is configured to cooperate with a vessel electrical engaging portion to electrically power a heating element of the vessel.

[0019] In one or more embodiments, an opaque backing medium is secured to the light pipe, wherein the opaque backing medium is configured to obscure the heating element being visible outside the vessel.

[0020] In one or more embodiments, at least some of the light pipe is positioned between the heating element and the one or more side walls to obscure the heating element from external view while transmitting light along the side walls.

[0021] In one or more embodiments, the kitchen appliance is a coffee grinder and the substance is coffee beans, wherein the vessel is a coffee bean hopper and the base is a housing including a grinding mechanism and a collar to releasably receive the hopper, wherein the illumination assembly is mounted to the collar.

[0022] In one or more embodiments, the kitchen appliance is an espresso machine including an integrated coffee grinder and the substance is coffee beans, wherein the vessel is a coffee bean hopper and the base is a housing including a grinding mechanism and a collar to releasably receive the hopper, wherein the illumination assembly is mounted to the collar.

[0023] In one or more embodiments, the vessel includes a plurality of light pipes, wherein when the vessel is supported by the base, the plurality of light pipes are positioned to receive and transmit light emitted from the illumination assembly.

[0024] In one or more embodiments, the vessel includes an electrical energy storage device in electrical communication with a vessel lighting assembly, wherein the electrical energy storage device and the vessel lighting assembly are fluidically sealed within the vessel, and wherein the electrical energy storage device is configured to electrically charge whilst the vessel is in electrical communication with the base and electrically discharge to operate the vessel lighting assembly when the vessel is removed from the base.

[0025] In one or more embodiments, the vessel lighting assembly is positioned to emit light through the light pipe when powered by the electrical energy storage device.

[0026] In one or more embodiments, the electrical energy storage device has sufficient energy storage capacity to power the vessel lighting assembly for at least thirty seconds after the vessel is removed from the base.

[0027] In one or more embodiments, the base includes base control circuitry configured to reduce an amount of light emitted by the illumination assembly when the vessel is removed from the base.

[0028] In one or more embodiments, the light pipe is integrally formed with the one or more side walls of the vessel.

[0029] In one or more embodiments, the light pipe comprises a passive optical element without electrical components, such that the vessel is cleanable by immersion in water or placement in a dishwasher.

[0030] In one or more embodiments, the one or more side walls are formed from transparent or translucent material to allow light transmitted by the light pipe to be visible externally.

[0031] In one or more embodiments, the vessel is removable from the base without disconnecting any electrical connections to the light pipe.

[0032] Other aspects and embodiments will be appreciated throughout the detailed description of examples.BRIEF DESCRIPTION OF FIGURES

[0033] The invention is described, by way of non-limiting example only, by reference to the accompanying figures.

[0034] FIG. 1 is an isometric view of an example of a kettle.

[0035] FIG. 2a is an isometric view of a vessel of the kettle of Figure 1.

[0036] FIG. 2b is an isometric view of a base of the kettle of Figure 1.

[0037] FIG. 3 is cross-sectional view of the kettle of Figure 1 including a magnified section showing the transfer of light through a light pipe of the vessel.

[0038] FIG. 4a is an isometric view of a light pipe separated from the vessel of the kettle of Figure 1.

[0039] FIG. 4b is an isometric view of the light pipe of Figure 4a with a backing medium removed from an inner surface thereof.

[0040] FIG. 4c is an isometric view of an alternate light pipe separated from the vessel of the kettle.

[0041] FIG. 4d is an isometric view of the light pipe of Figure 4c with a backing medium removed from an inner surface thereof.

[0042] FIG. 5a is a cross-sectional view of a first example of a light pipe showing the path of transmission of light throughout.

[0043] FIG. 5b is a cross-sectional view of a second example of a light pipe showing the path of transmission of light throughout.

[0044] FIG. 6 is a perspective view of an example of an alternate example of a light pipe with a textured upper rim showing a path of light transmission throughout.

[0045] FIG. 7 is a functional block diagram showing electrical components of the kettle including an electrical connection between the base and the kettle.

[0046] FIG. 8a is a schematic view of an example of an espresso machine with a hopper separated from a collar of the espresso machine.

[0047] FIG. 8b is a schematic view of an example of a coffee bean grinder with a hopper coupled with a collar of the coffee bean grinder.

[0048] FIG. 9a is a cross-sectional view of the hopper of the espresso machine / coffee bean grinder with the lid separated therefrom.

[0049] FIG. 9b is a cross-sectional view of the hopper of the espresso machine / coffee bean grinder with the lid coupled therewith.

[0050] FIG. 10a is a cross-sectional view of a further example of a kettle including a vessel lighting assembly.

[0051] FIG. 10b is a cross-sectional view of an alternate example of a kettle including a vessel lighting assembly.

[0052] FIG. 11 is a functional block diagram representing electrical components of the lighting assembly of the vessel of the kettle of Figure 10.

[0053] FIG. 12 is a circuit diagram of the electrical components of the vessel for the lighting assembly of the vessel of the kettle of Figure 10.

[0054] FIG. 13 is a flowchart representing a method performed by an example of the control circuitry of the vessel of the kettle of Figure 10 to control operation of the lighting assembly.

[0055] FIG. 14 is a block diagram of a controller that may be implemented in the base control circuitry or vessel control circuitry.DETAILED DESCRIPTION

[0056] The following modes, given by way of example only, are described to provide a more precise understanding of the subject matter of a preferred embodiment or embodiments. In the figures, incorporated to illustrate features of an example embodiment, like reference numerals are used to identify like parts throughout the figures.

[0057] The present disclosure relates to a kitchen appliance that seeks to address various challenges associated with illuminating substances contained within vessels and / or maintaining the ability to clean the vessel safely. The kitchen appliance includes a vessel configured to contain a substance and a base configured to removably support the vessel. The vessel incorporates a light pipe that extends from a bottom portion of the vessel along a portion of one or more side walls of the vessel. The base includes an illumination assembly that, when the vessel is supported by the base, is positioned adjacent to the light pipe to transmit light into the vessel.

[0058] The light pipe may be configured to receive light from the illumination assembly and distribute that light throughout the vessel, thereby illuminating the substance contained therein. This configuration allows users to observe the level and condition of the substance within the vessel while avoiding the need for electrical lighting components to be integrated within the vessel itself. By positioning the illumination assembly in the base rather than in the vessel, the vessel may be removed from the base and cleaned without risk of damaging electrical components through exposure to water or high temperatures.

[0059] In some aspects, the light pipe may include one or more ribs that extend along the side walls of the vessel. These ribs may be configured with an elbow profile that facilitates the transmission of light from the base upward along the vessel walls. The elbow profile may include a first portion that receives light from the illumination assembly and a second portion that directs light toward an opening of the vessel. The light pipe may include an annular structure from which the ribs extend, with the annular structure receiving light from the illumination assembly and distributing it to the individual ribs.

[0060] The illumination assembly may include light emitting diodes arranged in a strip or ring configuration. The light emitting portion of the illumination assembly may be mounted at or adjacent to a support surface of the base and oriented to emit light in a direction that facilitates efficient coupling with the light pipe. In some cases, the light emitting portion may be mounted to emit light substantially orthogonal to a central axis of the base, allowing the light to enter the light pipe through its lower portions.

[0061] The kitchen appliance may be configured as various types of appliances, including a kettle appliance, a coffee grinder, or an espresso machine with an integrated coffee grinder. In kettle configurations, the base may be electrically connectable to an electrical power source and may include electrical engaging portions that cooperate with corresponding portions on the vessel to provide electrical power to a heating element. An opaque backing medium may be secured to the light pipe to obscure internal components such as the heating element from being visible outside the vessel while still allowing light to be transmitted through the light pipe.

[0062] In coffee grinder or espresso machine configurations, the vessel may be a coffee bean hopper and the base may be a housing that includes a grinding mechanism and a collar configured to releasably receive the hopper. The illumination assembly may be mounted to the collar such that when the hopper is positioned on the collar, the light pipe of the hopper receives light from the illumination assembly.

[0063] In some aspects, the vessel may include multiple light pipes positioned at different locations around the vessel. When the vessel is supported by the base, these multiple light pipes may be positioned to receive and transmit light emitted from the illumination assembly, providing enhanced illumination coverage throughout the vessel.

[0064] In some embodiments, the vessel may include an electrical energy storage device in electrical communication with a vessel lighting assembly. Both the electrical energy storage device and the vessel lighting assembly may be fluidically sealed within the vessel to protect them from exposure to water during cleaning. The electrical energy storage device may be configured to electrically charge while the vessel is in electrical communication with the base and to electrically discharge to operate the vessel lighting assembly when the vessel is removed from the base. This configuration allows the vessel to remain illuminated even after removal from the base, providing continued visibility of the substance contained within the vessel during pouring or filling operations.

[0065] The vessel lighting assembly may be positioned to emit light through the light pipe when powered by the electrical energy storage device. The electrical energy storage device may have sufficient energy storage capacity to power the vessel lighting assembly for at least thirty seconds after the vessel is removed from the base, providing adequate time for typical pouring or filling operations.

[0066] The base may include control circuitry configured to adjust the operation of the illumination assembly based on whether the vessel is supported by the base. In some cases, the base control circuitry may be configured to reduce an amount of light emitted by the illumination assembly when the vessel is removed from the base, providing visual feedback to the user regarding the operational status of the appliance.

[0067] The light pipe may be integrally formed with the side walls of the vessel, providing a unitary construction that simplifies manufacturing and enhances structural integrity. In some aspects, the ribs of the light pipe may be arranged in a radial pattern around a central axis of the vessel, providing uniform light distribution throughout the vessel. The light pipe may include textured surfaces configured to enhance light distribution by scattering or redirecting light in predetermined directions.

[0068] Referring to FIG. 1 to FIG. 3, there is shown an example of the kitchen appliance 100 in the form of a kettle. The kitchen appliance 100 includes a vessel 104 and a base 106. The vessel 104 is configured to contain a substance 108, wherein the vessel 104 includes a light pipe 110 that extends from a bottom portion of the vessel 104 along a portion of one or more side walls 116 of the vessel 104. In the form of a kettle, the substance 108 can be water, although other substances could be contained therein. The light pipe 110 can include one or more ribs 112. The base 106 is configured to removably support the vessel 104, wherein the base 106 includes an illumination assembly 250. When the vessel 104 is supported by the base 106, the light pipe 110 is positioned adjacent to the illumination assembly 250 to receive and transmit light emitted therefrom throughout the plurality of ribs 112 to illuminate at least some of the substance 108 contained within the vessel 104.

[0069] Advantageously, the light pipe 110 that extends along the side walls 116 of the vessel 104 receives light 1500 from the illumination assembly 250 located in the base 106, providing a unique structural configuration that distinguishes from conventional lighting approaches. Unlike systems with internal light columns or embedded glass elements, the light pipe 110 extends continuously along the side walls 116, enabling comprehensive illumination throughout the vessel 104. This structural arrangement, where the illumination assembly 250 is separately mounted in the base 106 and the vessel 104 is removable, ensures that the vessel 104 does not include exposed electrical lights which can corrode during cleaning. Therefore, the user can remove the vessel 104 from the base 106 and place the vessel 104 in a cleaning apparatus, such as a dishwasher, without risk of corrosion or electrical fault / short circuit. The continuous side wall illumination provided by the light pipe 110 allows for the level of thesubstance 108 contained within the vessel 104 to be easily seen by the user from multiple viewing angles, thereby avoiding various issues such as heating excessive water in a kettle. Additionally, the light pipe 110 provides enhanced aesthetic appeal by creating an attractive illumination effect throughout the vessel 104, making the kitchen appliance more visually appealing to users. The passive light pipe system enables improved functionality by allowing users to clearly observe the contents of the vessel 104 even in low-light conditions, while the structural integration along the side walls 116 provides more uniform light distribution compared to bottom-only or point-source illumination systems. The light pipe 110 provides improved durability compared to traditional electrical lighting systems, as it contains no fragile electronic components that could be damaged during handling or cleaning, while the separate base-mounted illumination assembly 250 eliminates the need for complex electrical connections within the vessel 104, simplifying the overall design and reducing manufacturing costs while maintaining reliable illumination functionality.

[0070] In some embodiments, the light pipe 110 may be configured as a passive optical element that contains no electrical components, power sources, or active electronic devices. The light pipe 110 may be formed entirely from optically transmissive materials such as transparent or translucent polymers, glass, acrylic, polycarbonate, or other suitable lighttransmitting materials that do not require electrical power to function. By configuring the light pipe 110 as a passive optical element, the vessel 104 may be safely cleaned using various methods including immersion in water, placement in a dishwasher, exposure to cleaning solutions, or subjection to high-temperature washing cycles without risk of damaging electrical components, causing electrical shorts, or creating safety hazards. The passive nature of the light pipe 110 eliminates concerns about water ingress into electrical components, corrosion of electronic elements, or degradation of active lighting systems that would otherwise limit cleaning options. This passive optical configuration allows the vessel 104 to be thoroughly cleaned and sanitized while maintaining the illumination functionality through the base-mounted illumination assembly 250, thereby providing both enhanced hygiene and reliable long-term performance.

[0071] Continuing with FIGs 1 to 3, the kettle is a cordless kettle. The base 106 is electrically connectable to an electrical power source 702, such as via an electrical cable 700 (see Figure 7) having an electrical plug which can couple to a standard home electrical outlet 702 (see Figure 7). The base 106 includes a base electrical engaging portion 200 which is configured to cooperate with a vessel electrical engaging portion 202 to electrically power a heating element 114 of the vessel 104.

[0072] In some embodiments, the one or more ribs 112 may be arranged in a radial pattern around a central axis of the vessel 104. This radial arrangement may provide uniform light distribution throughout the vessel 104, as the ribs 112 extend outwardly from a central region toward the periphery of the vessel 104. The radial pattern may facilitate consistent illumination of the substance 108 contained within the vessel 104, regardless of the fill level. In some cases, the radial arrangement of the ribs 112 may also enhance the structural integrity of the light pipe 110 while maintaining efficient light transmission characteristics. The spacing between adjacent ribs 112 in the radial pattern may be uniform or may vary depending on the desired illumination effect and the specific geometry of the vessel 104.

[0073] As shown in FIG. 2a, the vessel 104 includes one or more side walls 116 defining an opening 118. The opening 118 is at least partially openable and closable using a lid 120 which is hingedly mounted and actuated using a lever 122. The lid defines an open spout whilst in the closed position to allow water to pour out of the spout. A handle 124 extends from the side wall 116 of the vessel 104. At least a portion of the light pipe 110 extends from a base section of the vessel 104 along a portion of the one or more side walls 116 toward the opening 118. Each rib 112 of the light pipe 110 has an elbow profile which includes a first portion extending substantially orthogonal to a central axis 304 of the base 106 and a second portion extending toward the opening 118 of the vessel 104. The first portion at least partially runs along an underside surface of the vessel 104 of the kettle in a direction substantially perpendicular to the central axis 304, and the second portion extends upwardly along a bottom portion of the side wall(s) 116.

[0074] In the context of the light pipe 110, the term "elbow profile" refers to a structural configuration where a rib 112 includes at least two portions that extend at different angles relative to each other, forming a bent or angled shape similar to an elbow joint. The elbow profile may be characterized by a change in direction along the length of the rib 112, where a first portion extends in a first direction and transitions into a second portion that extends in a second direction different from the first direction. The angle between the first and second portions may vary depending on the specific design requirements, and may range from acute angles to obtuse angles. In some cases, the transition between the first and second portions may be gradual, forming a curved elbow, while in other cases the transition may be more abrupt, forming a sharper angular bend. The elbow profile enables the rib 112 to receive light from the illumination assembly 250 in one direction and redirect that light in a different direction, facilitating efficient light transmission from the base 106 upward along the side walls 116 of the vessel 104. Configurations where the rib 112 includes a first portion extending substantially orthogonal to a central axis 304 of the base 106 and a second portion extending toward the opening 118 of the vessel 104 at an angle to the first portion constitute an "elbow profile" as used herein.

[0075] As shown in FIG. 2a, the light pipe 110 surrounds at least some of the base section 204 of the vessel 104. The base section 204 of the vessel 104 contains the heating element 114 and electrical control circuitry to heat the water contained within the vessel of the vessel 104. The one or more side walls 116 of the vessel 104 can be transparent, such as being made from glass, but other appropriate transparent materials could be used. The light pipe 110 which surrounds the base portion of the vessel 104 inhibits the user from viewing the control circuitry and at least some of the heating element 114. An upper surface of the heating element 114 is visible within the vessel 104. As shown in FIG. 2a, the upper section 208 of the vessel 104 may be secured to an opening 118 of the midsection 206 of the vessel 104. The upper section 208 may include the spout and the opening 118 sealed by the lid 120. The handle 124 can extend from a side surface of the upper section 208 of the vessel 104. The upper section 208 may be made of a different material, such as metal, a heat resistant andrigid polymer, or the like which can resist the temperature associated with boiling substances 108 such as water.

[0076] As shown in FIG. 2b, the base 106 has substantially planar and disc-like profile with a protrusion extending upwards which is the base electrical engaging portion 200. The upper surface 302 of the base 106 further includes a textured base surface 252 which the vessel 104 is supported thereon. The textured base surface 252 can be ribbed and is located adjacent the lighting assembly 250 when the vessel is located thereon, such that at least some of the light which is output by the lighting assembly 250 interacts with the textured base surface to create a unique optical lighting effect. The textured base surface 252 helps to illuminate the kettle to indicate whether the kettle is in operation.

[0077] As shown in FIG. 2b, the base 106 includes a user interface panel 254 including a plurality of user interface devices. In one form, the user interface devices include a dial 256 and a button 260. The user interface panel 254 also includes temperature adjustment buttons to increase the target temperature of the kettle. The temperature adjustment buttons include an increment target temperature button 262 and a decrement target temperature button 264. In addition, the user interface panel 254 includes a start button 266 and a stop button 268. The user interface panel 254 also includes a display device 270 which can present the target temperature in response to the increment temperature button 262 or the decrement temperature button 264 being selected by the user. The display device 270 can also present a current temperature received by a controller 1290 of the base 106 from a temperature sensor 723 of the vessel 104.

[0078] As shown in FIG. 3, the electrical lighting assembly 250 is a light emitting diode strip. The light emitting portion 300 of the electrical lighting assembly 250 is mounted substantially adjacent the upper surface 302 of the base 106 to emit light 1500 substantially orthogonal to a central axis 304 of the base 106. Electrical wiring 306 connected to the light emitting portion 300 can extend within the base 106 which stores therein one or more circuit boards 308 forming base control circuitry 309. In one form, the electrical lighting assembly 250 may be a lighting ring such as a COB (chip-on-board) LED (light emitting diode) device.The profile of the ribs 112 of the light pipe 110 allow for at least some of the light 1500 to exit each rib 112, as shown in FIG. 3, as well as at least some of the light 1500 to internally reflect within the ribs 112 of the light pipe 110, wherein at least a portion of a path 504 which the light travels is approximately parallel to the axis 304 of the base 106 and orthogonal to an entry path of the light within the light pipe 110. The light 1500 enters each rib 112 through a first portion that extends substantially orthogonal to the central axis 304 of the base 106, and is then guided through a second portion that extends toward the opening 118 of the vessel 104.

[0079] In one form, the base control circuitry 309 can control the illumination assembly 250 to emit a reduced amount of light compared to when the vessel 104 is supported by the base 106. For example, the light emitted by the illumination assembly 250 may be dimmed by a predefined proportion (e.g., 50%) in response to detecting that the vessel 104 has been removed from the base 106 in order to communicate visual feedback to the user. In one form, the base electrical connector, such as a 5 -pole connector, can receive a signal indicative of voltage drop across the NTC. In particular, the NTC resistance changes with the temperature change, thus as the voltage drop on the NTC resistance changes, the base control circuitry is configured to calculate the equivalent temperature value from the new voltage drop. When the vessel is lifted, the NTC circuit becomes open, basically removing the resistor from the circuit, and the circuit resistance become extremely high (e.g., megaohm level) such that the current equals zero, thus the voltage drop across the NTC also is zero. If the voltage drop is calculated as zero, the base control circuit has detected that the vessel has been lifted off the base. In response to the detection of the vessel having been removed from the base, the base control circuitry 309 is configured to reduce the electrical power provided to the illumination assembly 250 thus reducing the amount of light emitted by a predefined proportion of the maximum lighting that can be emitted by the illumination assembly 250. In response to the base control circuitry 309 detecting that a non-zero voltage drop occurs across the NTC, the base control circuitry 309 can increase the light emitted by the illumination assembly 250 to an increased proportion of the maximum lighting possible for the illumination assembly 250,or the maximum lighting. It will be appreciated that other types of vessel detection sensors could be used. For example, a hall effect sensor which is configured to sense a magnetic component of the vessel, an optical sensor which is configured to sense machine readable coded data printed on or adhered to the vessel, a switching system which is mechanically actuated to a detected position when the vessel is seated on the base, and the like.

[0080] Referring to FIG. 4a, 4b, 5a and 5b, the light pipe 110 includes an annular structure 400 which the plurality of ribs 112 extend therefrom. The light 1500 emitted from the electrical lighting assembly 250 is initially received by the annular structure 400 which then transfers the light to the one or more ribs 112 which extend radially therefrom. Each rib 112 includes a first portion extending substantially orthogonal to the central axis 304 of the base 106 and a second portion extending toward the opening 118 of the vessel 104. In the current embodiment, the light pipe 110 is secured to the base portion of the walls of the vessel 104. As shown in FIG. 3, an end portion 402 of each side wall 116 includes an initial in-turned elbow portion 404 and a downwardly directed elbow portion 406 which is received and secured within a well 408 of a heater module 410 of the vessel 104. The well 408 can be filled with heat resistant adhesive 412 such as silicone or a similar material to secure and seal the walls of the vessel with the heater module 410 which is in turned secured with the light pipe 110. The rim 414 of the light pipe 110 abuts the elbow of the initial in-turned elbow portion 404 of the side wall 116 of the vessel, such that light 1500 exiting the rim 414 of the light pipe 110 enters the wall 116 of the vessel if configured to transmit light, such as glass or the like.

[0081] Referring to FIG. 4a, an opaque backing medium 416 can be secured to the light pipe 110. The opaque backing medium 416 can be secured to the inner surface of the light pipe 110 using overmolding. The opaque backing medium 416 is configured to obscure the heating element 114 being visible outside the vessel 104 which is preferably transparent. FIG. 4b shows the light pipe 110 with the opaque backing medium 416 removed. As can be seen, the annular structure 400 of the light pipe 110 can include one or more mounting holes452 for securing the light pipe 110 to the heater module 410 located within a cavity 454 defined by the light pipe 110.

[0082] In some embodiments, at least some of the light pipe 110 may be positioned between the heating element 114 and the one or more side walls 116 to obscure the heating element 114 from external view while transmitting light along the side walls 116. This positioning provides a dual function: the light pipe 110 acts as a visual barrier that prevents the heating element 114 and associated electrical components from being visible through the transparent side walls 116, while simultaneously serving as an optical conduit that transmits light from the illumination assembly 250 upward along the side walls 116 to illuminate the substance 108. The intermediate positioning of the light pipe 110 between the heating element 114 and the side walls 116 ensures that users can observe the illuminated substance 108 without being distracted by the appearance of internal mechanical and electrical components, thereby enhancing the aesthetic appeal of the kitchen appliance 100 while maintaining functional illumination.

[0083] Referring to FIG. 5a, each rib 112 has an elbow profile. The annular structure 400 has a substantially constant thickness. Each rib 112 extends radially from the annular structure 400 in a radial pattern around the central axis 304 of the vessel 104, with the ribs 112 being distributed circumferentially around the annular structure 400 to provide uniform light distribution throughout the vessel 104. Each rib 112 includes a first portion extending substantially orthogonal to the central axis 304 of the base 106 and a second portion extending toward the opening 118 of the vessel 104. The radial arrangement of the ribs 112 ensures that light is transmitted evenly around the circumference of the vessel 104, creating a consistent illumination pattern. The thickness of each rib 112 gradually increases from the annular structure 400. In the configuration shown in FIG. 5a, the thickness of each rib 112 expands as it extends away from the annular structure 400. However, this configuration shown in FIG. 5a includes an inwardly projecting portion 502 which is not located along a transmission path of light 504 through the rib 112. As such, this configuration can create a darkened ring around the bottom portion of the vessel. To reduce or remove the presence ofthe darkened ring, the profile of each rib 112 can be adjusted as shown in FIG. 5b. Referring to FIG. 5b, each rib 112 tapers toward an end 508 thereof extending upward the side wall 116 of the vessel. The tapering of the end 508 of each rib 112 causes at least some of the light received via the first portion extending substantially orthogonal to the central axis 304 of the base 106 to be internally reflected along a path 504 which is substantially parallel with an inner surface 510 of the second portion of the rib 112 which faces the heater module 410.This configuration reduces or removes the presence of the darkened section (e.g. ring) around the base section 204 of the vessel 104.

[0084] The annular structure 400 and ribs 112 may be configured to distribute light circumferentially around the vessel 104 to provide uniform illumination of the substance 108. The annular structure 400 receives light from the illumination assembly 250 and distributes that light around its circumference to the plurality of ribs 112 that are positioned at intervals around the central axis 304. This circumferential distribution ensures that light is transmitted along multiple ribs 112 distributed around the perimeter of the vessel 104, creating a substantially uniform illumination pattern that allows the substance 108 to be visible from multiple viewing angles around the vessel 104. The circumferential light distribution may be particularly advantageous for enabling users to observe the level and condition of the substance 108 regardless of the rotational orientation of the vessel 104 or the viewing position of the user relative to the vessel 104.

[0085] In some embodiments, the annular structure 400 may be configured with optical properties that facilitate uniform circumferential light distribution by receiving light from the illumination assembly 250 at one or more input locations and propagating that light around the entire circumference through internal reflection and transmission. The annular structure 400 may have a cross-sectional geometry that promotes light propagation around its circumferential path, such as a rectangular, circular, or trapezoidal cross-section with polished or smooth internal surfaces that minimize light loss during circumferential transmission. The material of the annular structure 400 may be selected to have appropriate refractive index characteristics that enable efficient light coupling from the illuminationassembly 250 and subsequent distribution to the ribs 112. In some cases, the annular structure 400 may include a continuous ring of optically transmissive material that extends around the entire perimeter of the vessel 104, allowing light to travel circumferentially through total internal reflection or guided wave propagation. The junction between the annular structure 400 and each rib 112 may be configured to extract a predetermined portion of the circumferentially propagating light, with the extraction efficiency at each junction being selected to achieve uniform light distribution among all ribs 112. In some aspects, the cross- sectional area of the annular structure 400 may be sized relative to the number and spacing of the ribs 112 to ensure that sufficient light reaches ribs 112 positioned at greater circumferential distances from the illumination assembly 250. The annular structure 400 may also include surface treatments or geometric features that promote scattering or redirection of light at specific locations to enhance uniformity of light distribution to the ribs 112. In some cases, the illumination assembly 250 may include multiple light sources positioned at different circumferential locations around the annular structure 400 to provide more uniform initial light input, thereby reducing the circumferential distance that light must travel within the annular structure 400 before being distributed to the ribs 112.

[0086] Referring to FIG. 6, there is shown an alternate light pipe 110 of the kettle of FIG. 1. The light pipe 110 of FIG. 1 includes a planar rim 414. In contrast, the alternate light pipe 110 of FIG. 6 includes a non-planar profile. For example, the rim 414 can include a plurality of scalloped sections 600 which form an undulating, corrugated or fluted profile. In additional or alternate embodiments, each rib 112 can extend diagonally relative to the central axis 304 as shown in FIG. 6. Both of these configurations allow for the light to travel and along the light pipe 110 in directions which are not orthogonal or parallel to the central axis 304 to create a unique visual effect.

[0087] Referring to FIG. 7, there is shown a functional block diagram representing various electrical components and electrical signals transferred between the vessel 104 and the base 106. The base 106 includes an electrical cable 700 which includes a live line 704, a neutral line 706 and an earth line 708. The base 106 also includes a user interface board 710for receiving user input via a user interface displayed by the base 106 and presenting feedback via the user interface panel 254. The base 106 also includes an electrical power board 712 which is in electrical communication with the electrical cable 700 and the base electrical connector which cooperates with the corresponding vessel electrical connector. The base electrical connector is preferably a male 5-pole electrical connector and the vessel electrical connector is preferably a corresponding female 5-pole electrical connector. The 5- pole electrical connectors include a live connector 714, a neutral connector 716, and an earth connector 718 in order to electrically power the heater of the vessel 104. Furthermore, the electrical connectors include a temperature sensor connector 720 to receive a temperature reading from a temperature sensor 723 such as a Negative Temperature Coefficient (NTC) thermistor of the vessel, and a lighting connector 722 to control the lighting assembly 250 of the vessel. As such, a single signal, namely a lighting signal received via the lighting connector of the 5-pole electrical connector, is utilised from the base 106 to determine when the lighting assembly 250 should be activated.

[0088] Referring to FIG. 8a, FIG. 9a and FIG. 9b there is shown another example of a kitchen appliance 100 provided in the form of an espresso machine 800 including an integrated coffee grinder. The vessel 104 of the espresso machine 800 is a hopper 801 which contains coffee beans. The base 106 is a housing 802 of the espresso machine 800 housing the grinding mechanism (not shown). The housing 802 includes a collar 804 to releasably receive the hopper 801, wherein the collar 804 is configured to removably engage with the hopper 801 such that the hopper 801 can be detached from the collar 804 for cleaning or refilling without requiring tools or permanent disassembly. The releasable connection between the collar 804 and hopper 801 may be achieved through mechanical engagement features such as bayonet connections, threaded engagement, snap-fit mechanisms, or friction- fit arrangements that allow the hopper 801 to be securely held in position during operation while permitting easy removal when desired. The electrical lighting assembly 250 is mounted to the collar 804. As light is emitted by the electrical lighting assembly 250 of the collar 804, the light is transmitted along the light pipe 110 of the hopper 801, thereby illuminating thecoffee beans (not shown) within the hopper 801. Further details regarding the espresso machine 800 are disclosed in International Patent Application No. PCT / AU2010 / 000087, the contents of which is incorporated by reference in its entirety.

[0089] In some embodiments, the collar 804 may include structural features specifically configured to enable the releasable connection with the hopper 801. The collar 804 may include an inner circumferential surface that defines a receiving opening sized to accommodate a corresponding outer surface of the hopper neck 902. The collar 804 may include one or more engagement features formed on or extending from the inner circumferential surface, wherein the engagement features are configured to cooperate with corresponding engagement features on the hopper 801 to secure the hopper 801 in position during operation while permitting intentional removal by a user. In some cases, the engagement features may include one or more protrusions, recesses, grooves, ridges, or combinations thereof that are positioned to engage with complementary features on the hopper 801. The engagement features may be configured to provide a predetermined retention force that maintains the hopper 801 in position during normal operation while allowing the hopper 801 to be removed through application of a reasonable manual force by a user. In some aspects, the collar 804 may include a bayonet-style connection comprising one or more radial projections on the collar 804 that engage with corresponding L-shaped or J- shaped slots on the hopper 801, wherein the hopper 801 may be inserted into the collar 804 and rotated to engage the projections within the slots, and may be removed by rotating in the opposite direction to disengage the projections from the slots. In other aspects, the collar 804 may include threaded engagement features comprising helical threads formed on the inner surface of the collar 804 that engage with corresponding external threads on the hopper neck 902, wherein the hopper 801 may be secured by rotating in a first direction to advance the threads into engagement and may be removed by rotating in a second direction to withdraw the threads from engagement. In some cases, the collar 804 may include snap-fit engagement features comprising one or more resilient tabs, fingers, or arms that deflect during insertion of the hopper 801 and return to an undeflected position to engage with a corresponding recess,groove, or shoulder on the hopper 801, wherein the hopper 801 may be removed by applying sufficient force to deflect the resilient features and disengage them from the corresponding features on the hopper 801. In some aspects, the collar 804 may include friction-fit engagement features wherein the inner surface of the collar 804 has a diameter slightly smaller than the outer diameter of the hopper neck 902, creating an interference fit that generates frictional forces to retain the hopper 801 in position, wherein the hopper 801 may be removed by applying sufficient axial force to overcome the frictional retention forces. The collar 804 may also include alignment features such as keys, flats, or asymmetric profiles that ensure the hopper 801 is positioned in a predetermined rotational orientation relative to the collar 804, thereby ensuring proper alignment of the light pipe 110 with the illumination assembly 250 and proper positioning of any other functional features. In some cases, the collar 804 may include a locking mechanism such as a latch, lever, or button that may be actuated by a user to secure the hopper 801 in position or to release the hopper 801 for removal, wherein the locking mechanism provides positive indication of the secured or released state of the connection.

[0090] Referring to FIG. 8b, there is shown another example of a kitchen appliance 100 provided in the form of a coffee bean grinder 850. The vessel 104 of the coffee bean grinder 850 is a hopper 801 which contains coffee beans (not shown). The base 106 is a housing 802 of the coffee bean grinder 850 housing the grinding mechanism (not shown). The housing 802 includes a collar 804 to releasably receive the hopper 801, wherein the collar 804 provides a removable connection mechanism that allows the hopper 801 to be easily attached to and detached from the housing 802 without the need for tools or permanent fasteners. The releasable engagement between the collar 804 and hopper 801 enables convenient removal of the hopper 801 for cleaning, maintenance, or refilling operations while ensuring secure positioning during normal use. The electrical lighting assembly 250 is mounted to the collar 804. As light is emitted by the electrical lighting assembly 250 of the collar 804, the light is transmitted along the light pipe 110 of the hopper 801, thereby illuminating the coffee beans (not shown) within the hopper 801. Further details regarding the coffee bean grinder 850 aredisclosed in International Patent Application No. PCT / AU2011 / 000274, the contents of which is incorporated by reference in its entirety.

[0091] Advantageously, the user can see the level of the coffee beans within the hopper 801 if coffee bean dust has occluded the user's ability to see the level of the coffee beans contained therein. Furthermore, given the hopper 801 includes no active lighting system, but rather a passive lighting arrangement in the form of a light pipe 110 which is in optical communication with the lighting assembly 250 of the collar 804 when in the coupled position, the hopper 801 can be removed from the collar 804, emptied of any remaining coffee beans contained therein and cleaned / washed, such as being placed in a dishwashing machine or immersed in water. The light pipe 110 will not corrode via exposure to water which would occur for active lighting systems, such as LEDs and the like. Additionally, the light pipe 110 provides improved durability compared to traditional electrical lighting systems, as it contains no fragile electronic components that could be damaged during handling or cleaning. The passive nature of the light pipe 110 also eliminates the need for complex electrical connections within the hopper 801, simplifying the overall design and reducing manufacturing costs while maintaining reliable illumination functionality.

[0092] As shown in FIGs. 9a and 9b, the light pipe 110 is integrally formed with wall(s) 900 of the hopper 801. The hopper walls 900 can be made of a rigid plastic material. The light pipe 110 can be integrally molded with the hopper walls 900. The walls 900 of the hopper 801 defines a neck 902 which is received within the collar 804. The neck 902 extends upwardly and outwardly defining an opening 904 which is wider than the neck 902. The opening 904 is sealed with a lid 906 that tight-fittingly cooperates with the inner surface of the wall 900 of the hopper 801. The light pipe 110 extends from the neck 902 to a terminating position adjacent a rim 908 of the opening 904 of the hopper 801. In this configuration, the lighting assembly 250 including light emitting portions 300 inwardly face a central axis 304 of the collar 804. One or more openings of the light pipe of the neck 902 are positioned adjacent to the light emitting portions 300 of the lighting assembly 250 of the collar 804. At least some of the light that enters the light pipe travels upwardly toward the opening 904 ofthe hopper 801. Due to the illumination created by the light pipe 110 of the hopper 801, the level of coffee beans contained within the hopper 801 can be clearly seen through the walls 900 of the hopper 801. It will be appreciated that the hopper walls 900 are substantially transparent.

[0093] Referring to FIG. 10a there is shown a further example of a kitchen appliance 100 provided in the form of a further kettle 1000. The kitchen appliance 100 includes a vessel 104 and a base 106. The vessel 104 is configured to contain a substance 108. The vessel 104 includes a light pipe 110. The light pipe 110 includes one or more ribs 112. The base 106 is configured to removably support the vessel 104. The base 106 includes an electrical lighting assembly 250. When the vessel 104 is supported by the base 106, the light pipe 110 is positioned adjacent to the electrical lighting assembly 250 to receive and transmit light, emitted from the electrical lighting assembly 250, throughout to illuminate at least some of the substance 108 contained within the vessel. The vessel 104 includes an electrical energy storage device 1106 in electrical communication with a vessel lighting assembly 1010. The electrical energy storage device 1106 and the vessel lighting assembly 1010 are fluidically sealed within the base section 204 of the vessel 104. The electrical energy storage device 1106 is configured to electrically charge whilst the vessel 104 is in electrical communication with the base electrical engaging portion 200, and electrically discharge to operate the vessel lighting assembly 1010.

[0094] Advantageously, the water level within the kettle 1000 can still be easily determined by the user after the vessel 104 has been separated from the base 106. This can be advantageous when filling the vessel 104 or pouring out liquid from the vessel 104. Furthermore, as the vessel lighting assembly 1010 and electrical energy storage device 1106 are fluidically sealed, the vessel 104 can be cleaned, such as placing the vessel 104 within a dishwasher or submerging in water. Additionally, the electrical energy storage device 1106 provides continuous illumination functionality even when the vessel 104 is removed from the base 106, ensuring that users can always monitor the substance level regardless of the vessel's position. The fluidic sealing of the electrical components also enhances the overall safety ofthe appliance by preventing water ingress that could cause electrical hazards or component failure.

[0095] The vessel lighting assembly 1010 can be provided in the form of a LED strip or ring, such as a COB LED strip. As shown in FIG. 10a, the vessel lighting assembly 1010 is located within a well 408 defined by the heater module 410 of the vessel. The well 408 additionally stores therein an end portion 402 of the wall of the vessel. The well 408 can be filled with an adhesive 412 such as a high temperature silicon adhesive.

[0096] Referring to FIG. 10b, there is shown an alternate embodiment of the kettle disclosed in FIG. 10a. In particular, the kettle of FIG. 10b does not include a light pipe. The vessel 104 includes an electrical energy storage device 1106 in electrical communication with a vessel lighting assembly 1010. The electrical energy storage device 1106 and the vessel lighting assembly 1010 are fluidically sealed within the base section 204 of the vessel 104. The electrical energy storage device 1106 is configured to electrically charge whilst the vessel 104 is in electrical communication with a base electrical engaging portion 200 of the base, and electrically discharge to operate the vessel lighting assembly 1010.

[0097] Advantageously, the water level within the kettle 1000 can still be easily determined by the user after the vessel 104 has been separated from the base 106. This can be advantageous when filling the vessel 104 or pouring out liquid from the vessel 104. Furthermore, as the vessel lighting assembly 1010 and electrical energy storage device 1106 are fluidically sealed, the vessel 104 can be cleaned, such as placing the vessel 104 within a dishwasher or submerging in water. The self-contained lighting system also provides enhanced portability, allowing users to move the illuminated vessel to different locations without losing visibility of the contents. This configuration also reduces dependency on the base unit for lighting functionality, providing greater flexibility in use.

[0098] The vessel lighting assembly 1010 can be provided in the form of a LED strip or ring, such as a COB LED strip. As shown in FIG. 10b, the vessel lighting assembly 1010 is located within a well 408 defined by the heater module 410 of the vessel. The well 408additionally stores therein an end portion 402 of the wall of the vessel. The well 408 can be filled with an adhesive 412 such as a high temperature silicon adhesive.

[0099] Referring to FIG. 11 there is shown a functional block diagram of control circuitry 1100 for controlling the electrical storage device 1106 and the vessel lighting assembly 1010 of the vessel. The control circuitry 1100 includes a base power detection circuit 1102 and a charging circuit 1104. The base power detection circuit 1102 is configured to detect that the vessel electrical engaging portion 202 is electrically connected to the electrical power source and that the electrical energy storage device 1106 is not fully charged. The charging circuit 1104 configured to electrically connect the electrical energy storage device 1106 with the electrical power source to charge the electrical energy storage device 1106 in response to a positive detection by the base power detection circuit.

[0100] As shown in FIG. 11, the base detection circuit can be electrically connected to a switching circuit 1108. If the base detection circuit generates an output signal indicative of the vessel 104 being removed from the base 106, the switching circuit 1108 closes such that the power storage device 1106 is electrically connected to the vessel lighting assembly 1010 so as to electrically power the vessel lighting assembly 1010 whilst the vessel 104 has been removed from the base 106. As represented in FIG. 11, the control circuity 1100 is also configured to detect that the vessel electrical engaging portion 202 is electrically disconnected from the electrical power source and that the electrical energy storage device 1106, and in response to a positive detection, electrically connect the electrical energy storage device 1106 with the vessel lighting assembly 1010 to emit light therefrom. If the base power detection circuit 1102 is supported or engaged with the base 106, the base power detection circuit 1102 enables the charging circuit 1104 to recharge the power storage device 1106 and also operate the vessel lighting assembly 1010. In this state, the switching circuitry 1108 operates in an open state such that the power storage device 1106 does not discharge to power the vessel lighting assembly 1010 whilst the vessel 104 is located on the base 106.

[0101] Referring to FIG. 12, a specific example of the control circuitry 1100 of the base 106 and vessel 104 is shown. The control circuitry 1100 includes base control circuitry 309and vessel control circuitry 1201. The vessel control circuitry 1201 incorporates a charging circuit 1202 that is electrically connected to the energy storage device 1106 and configured to regulate the charging process. The charging circuit 1202 includes current limiting components and voltage regulation elements to ensure safe and efficient charging of the energy storage device 1106. Various points are notable about the circuitry shown in FIG. 12. For example, the energy storage device 1106 can be provided in the form of a capacitor, such as a super-capacitor, or a rechargeable battery. Additionally, the base power detection circuitry includes an amplification circuit 1203 provided in the form of a NPN Darlington transistor circuit based on detecting electrical power provided by the base 106, which can be a 12 Volt power source. The Darlington transistor circuit 1203 comprises a first transistor Q3 and a second transistor Q4 arranged in a cascaded configuration to provide high current gain. Given a small base current flowing to the first transistor Q3, a much larger collector current flows into the first transistor Q3 and out of the emitter thereof. This becomes the base current of the second transistor Q4, which amplifies the current still further. For small base currents, the gain of the Darlington pair 1203 equals the gain of first transistor Q3 multiplied by the gain of the second transistor Q4. The first transistor Q3 and second transistor Q4 are electrically connected such that the emitter of the first transistor Q3 is directly coupled to the base of the second transistor Q4, creating a compound transistor configuration that provides enhanced sensitivity to base power detection. As highlighted in FIG. 12, the switching circuitry 1108 can include a MOSFET transistor 1206 that operates as a power switch to control current flow from the energy storage device 1106 to the vessel lighting assembly 1010. The MOSFET transistor 1206 is electrically connected between the energy storage device 1106 and the vessel lighting assembly 1010, with its gate terminal controlled by the output of the Darlington transistor circuit 1203. When the vessel 104 is not supported by the base 106, the MOSFET 1206 operates in an ON state. A voltage at P-Ch MOSFET Gate becomes higher than the minimum threshold voltage (Vgs) as the Darlington pair 1203 is deactivated when the base power source is not present, so the current can flow from the energy storage device 1106 to the vessel lighting assembly 1010. When the vessel 104 is supported by the base 106, the MOSFET 1206 operates in an OFF state. A voltage at P-ChMOSFET Gate becomes lower than the minimum threshold voltage (Vgs) as the Darlington pair 1203 is activated when the base power source is present, so the current cannot flow through the energy storage device 1106 to the vessel lighting assembly 1010. The base control circuitry 309 includes power management components and communication interfaces that coordinate with the vessel control circuitry 1201 to monitor charging status and control lighting operations.

[0102] In one form, once the energy storage device 1106 has been fully recharged, the vessel lighting assembly 1010 can be operated to present one or more optical patterns or animations such as fading in / out, blinking, etc. In another form, the base control circuit 309 can be configured to detect a power draw by the vessel 104. If no power is being drawn (i.e. the vessel 104 has been removed from the base 106), the base 106 control circuit can reduce the light emitted by the lighting assembly 250 of the base 106 such that it illuminates with a reduced luminosity, thereby providing visual feedback to the user that the vessel 104 is not supported upon the base 106. This can be beneficial if the electrical connectors of the base 106 and the vessel 104 have not been placed in electrical cooperation with each other due to misalignment of the vessel 104 being supported upon the base 106. The control circuitry of the base 106 can include a pulse width modulation (PWM) circuit to achieve the visual effects with respect to the lighting. Advantageously, the optical patterns and animations provide enhanced user feedback, making it easier to understand the operational status of the appliance. The reduced luminosity feature also helps conserve energy when the vessel is not in use, contributing to improved energy efficiency of the overall system.

[0103] The base control circuitry 309 comprises several electrical components including a microcontroller unit 1290, power supply circuits, communication interfaces, and driver circuits. The microcontroller unit 1290 may be configured to execute control algorithms for managing the heating element 114, monitoring temperature readings from the temperature sensor 723, and controlling the illumination assembly 250. The power supply circuits may include voltage regulators and filtering components to convert the electrical power received from the electrical cable 700 into appropriate voltage levels for the various circuitcomponents. The communication interfaces may include signal conditioning circuits and interface circuits configured to receive signals from the vessel electrical engaging portion 202 through the base electrical engaging portion 200, including signals from the temperature sensor connector 720 and the lighting connector 722.

[0104] The circuit operates by receiving electrical power through the electrical cable 700, which includes the live line 704, neutral line 706, and earth line 708. The power supply circuits process this incoming power to generate regulated voltage levels for the microcontroller unit 1290 and other circuit components. When the vessel 104 is placed on the base 106, the base electrical engaging portion 200 engages with the vessel electrical engaging portion 202, establishing electrical connections through the live connector 714, neutral connector 716, earth connector 718, temperature sensor connector 720, and lighting connector 722. The microcontroller unit 1290 receives temperature data from the temperature sensor 723 via the temperature sensor connector 720 and processes this information to determine whether heating should be activated or deactivated. The microcontroller unit 1290 may also monitor the voltage drop across the temperature sensor 723, which may be configured as an NTC thermistor, to detect when the vessel 104 has been removed from the base 106. When a zero voltage drop is detected, indicating an open circuit condition, the microcontroller unit 1290 may reduce the electrical power supplied to the illumination assembly 250 through the driver circuits, thereby dimming the light output to provide visual feedback to the user.

[0105] The driver circuits may include transistor-based switching circuits and current limiting components configured to control the illumination assembly 250. The microcontroller unit 1290 may generate pulse width modulation (PWM) signals to control the brightness of the illumination assembly 250, allowing for various visual effects such as fading, blinking, or other optical patterns. The base control circuitry 309 may also include protection circuits such as overcurrent protection, overvoltage protection, and thermal protection to ensure safe operation of the kettle 1000. The communication interfaces may facilitate bidirectional communication between the base control circuitry 309 and the vesselcontrol circuitry 1201, allowing for coordinated control of heating operations and lighting functions.

[0106] Referring more specifically to FIG. 12, the base control circuit 309 includes a controller 1290, which may be implemented as a microcontroller or other logic device configured to generate a control signal 1291. The control signal 1291 is applied through a resistor network including resistors R3 and R4 to the base of an NPN transistor QI. Transistor QI controls the conduction state of a switching device Ml, which may be implemented as a MOSFET or other suitable semiconductor switch. Resistors R1 and R2 provide biasing for transistor QI, and diode DI isolates the downstream circuitry from reverse current flow. A capacitor Cl is coupled to the supply node V12 to provide transient suppression or filtering. When the controller 1290 asserts the control signal 1291, transistor QI is driven into conduction, causing switching device Ml to apply the supply voltage V12 to the vessel control circuitry 1201 when the vessel is docked with the base.

[0107] The vessel control circuitry 1201 includes an energy-storage circuit configured to accumulate charge on a storage capacitor C2, which may comprise a supercapacitor or other high-capacity energy-storage element. The supply voltage delivered by switching device Ml is routed through diode D2 and an optional current-limiting resistor R12 to charge the storage capacitor C2. Diode D2 prevents discharge of capacitor C2 back toward the base circuitry when the vessel is undocked or when the supply voltage is reduced or disabled. The stored energy is selectively delivered to an output node Vout through a switching device M2. A resistor network including resistors R6 and R7 provides biasing for the control terminal of switching device M2. A load, illustrated in FIG. 12 as an LED strip and associated resistor R5, is coupled to the output node Vout and is powered either from the base supply or from the stored energy of capacitor C2 when the vessel is removed from the base.

[0108] The vessel includes a base power detection circuit 1102 configured to monitor the presence of supply voltage and generate control signals for regulating the operation of switching device M2. The base power detection circuit 1102 incorporates a plurality of passive and active components, including third capacitor C3 and fourth capacitor C4, eighthresistor R8, ninth resistor R9, and tenth resistor RIO, and third diode D3, fifth diode D5, and seventh diode D7. The circuit also includes second transistor Q2, which cooperates with the surrounding components to sense the supply voltage presence, respond to transient voltage variations, and condition the signal delivered to the subsequent Darlington transistor circuit 1203. Third capacitor C3 and fourth capacitor C4 may provide timing or filtering functions, while eighth resistor R8 and ninth resistor R9 establish biasing and gain characteristics. Third diode D3, fifth diode D5, and seventh diode D7 isolate functional paths and set forwardconduction thresholds for the control signals.

[0109] The control signal generated by the vessel power-monitoring circuit 1102 is supplied to an amplification stage 1203, which includes transistors Q3 and Q4. These transistors are arranged to provide signal amplification and level shifting sufficient to drive switching device M2 and maintain the output voltage Vout. A resistor R11 biases the transistor pair and establishes the operating point of the amplification stage.

[0110] During normal operation, when the input supply voltage V12 is present and exceeds a predetermined threshold, the amplification stage maintains switching device M2 in a conductive state, enabling energy from capacitor C2 and / or the supply voltage to be delivered to the load. When the vessel is removed from the base, or when the input supply voltage decreases or becomes unavailable, the power-monitoring circuit 1102 and the amplification transistors Q3, Q4 cooperate to regulate switching device M2, thereby allowing energy stored in capacitor C2 to continue powering the load at node Vout.

[0111] Collectively, the circuitry of FIG. 12 forms a controlled energy -buffering system in which the base circuit selectively applies a supply voltage to the vessel circuitry when docked, the vessel circuitry accumulates energy in a storage capacitor, and the monitoring and amplification stages regulate delivery of that stored energy to a load when the vessel is undocked or otherwise operating independently of the base.

[0112] The electrical connection between the base 106 and the vessel 104 enables the base supply voltage to be selectively applied to the vessel's energy -storage and load-drive circuitry. The controller 1290 of the base 106 activates a first switching device Ml thatcouples the supply voltage to the appliance, permitting charging of the appliance's storage capacitor C2 and powering of the appliance load. The vessel's circuitry monitors the storage capacitor C2 voltage and regulates the output drive stage during docked operation, preparing the vessel 104 to continue operating independently using the stored energy when removed from the base 106.

[0113] More specifically, mechanical or magnetic docking elements bring the vessel's terminals into contact with corresponding terminals of the base 106. This completes an electrical path allowing the base supply voltage V12 to be presented to first switching device Ml. The controller 1290 of the base 106 detects that the appliance is present (for example, through a sensor, switch, or predetermined docking logic) and asserts the control signal 1291 applied to first transistor QI. When first transistor QI is driven into conduction, first switching device Ml becomes conductive, thereby coupling the base supply voltage V12 to first diode DI and onward to the appliance circuitry. The supply voltage provided through first switching device Ml reaches the appliance's energy-storage circuit. The voltage is applied through second diode D2 and optional twelfth resistor R12 to charge the storage capacitor C2. Second diode D2 ensures that charging occurs only in the forward direction and prevents any discharge back into the base circuitry. During this time, storage capacitor C2 accumulates energy that will allow the appliance to continue operating after it is removed from the base 106. While docked, the load of the appliance (e.g., the LED strip) may be powered directly from the base supply V12 through first switching device Ml, and / or indirectly through storage capacitor C2, depending on the operating state of second switching device M2. The control and amplification circuits 1102, 1203 regulate the conduction of second switching device M2 so that the output node Vout remains within a desired operating range while the appliance is connected. The appliance's base power detection circuit 1102 continuously senses the voltage on storage capacitor C2 and conditions a control signal used to regulate second switching device M2. While docked, this ensures proper charging of the storage capacitor C2, stable operation of the output stage, and protection against overdischarge or improper loading.

[0114] When the appliance is undocked from the base 106, the base supply voltage is removed, and isolation diodes prevent reverse current flow into the base 106. The appliance then operates independently using the energy stored in its internal storage capacitor C2. The vessel power-monitoring circuit senses the storage capacitor C2 voltage and cooperates with the amplification stage to regulate a switching device that delivers the stored energy to the appliance load. As a result, the load continues to be powered for a period of time after undocking until the storage capacitor C2 is discharged below a usable level.

[0115] More specifically, when the appliance is removed from the base 106, the electrical connection between the base control circuitry 309 and the vessel control circuitry 1201 is interrupted. As a result, the supply voltage V12 provided by the base 106 is no longer available to the vessel 104. Removal of the appliance physically opens the conductive path through which the base supply voltage was previously applied. First switching device Ml no longer provides voltage to first diode DI, and first diode DI and second diode D2 prevent any reverse discharge of the storage capacitor C2 toward the base terminals. This isolates the appliance circuitry so that it operates solely from locally stored energy. Because storage capacitor C2 was charged while the appliance was docked, the stored energy becomes the only available source of power for the vessel circuitry once undocked. The voltage present on storage capacitor C2 is applied to second switching device M2, thereby enabling second switching device M2 to continue supplying power to the output node Vout. The vessel's base power detection circuit 1102 continues to sense the voltage on storage capacitor C2 and generates a control signal reflecting the available stored energy. Second transistor Q2 conditions this signal, while third diode D3, fifth diode D5, and seventh diode D7, together with timing capacitors third capacitor C3 and fourth capacitor C4 and resistor network eighth resistor R8 and tenth resistor R10, maintain appropriate biasing and thresholding. This ensures that the control signal delivered to the amplification stage remains responsive to decreasing capacitor voltage during undocked operation. The control signal from base power detection circuit 1102 is applied to the Darlington transistor circuit 1203, including third transistor Q3 and fourth transistor Q4. These transistors amplify and level-shift the controlsignal so that second switching device M2 remains biased correctly despite declining storage voltage. Eleventh resistor R11 establishes the operating point of the amplification stage. By maintaining proper drive at second switching device M2, the output voltage Vout remains sufficient to power the load for as long as energy remains in storage capacitor C2. The load (e.g., the LED strip and fifth resistor R5) continues to receive regulated power from second switching device M2 during the undocked interval. As the voltage on storage capacitor C2 declines over time, the monitoring and amplification circuits dynamically adjust the drive to second switching device M2 to provide a controlled discharge profile. The load remains powered until the storage capacitor C2 voltage falls below the operational threshold for the control and output stages.

[0116] The specific component values and configurations shown in FIG. 12 are provided for illustrative purposes only and may be varied to suit particular design requirements. The resistor values first resistor R1 through twelfth resistor R12 may be selected based on factors such as desired current levels, voltage drops, and timing characteristics. The capacitance values of capacitors first capacitor Cl through fourth capacitor C4 may be chosen to provide appropriate filtering, energy storage capacity, and transient response characteristics. The selection of transistors first transistor QI through fourth transistor Q4 and switching devices first switching device Ml and second switching device M2 may depend on factors such as voltage ratings, current handling capabilities, switching speeds, and thermal characteristics. The diodes first diode DI through seventh diode D7 may be selected based on forward voltage drop, reverse breakdown voltage, and switching speed requirements. In some cases, alternative circuit topologies may be employed to achieve similar functionality, such as using different transistor configurations, alternative switching device types, or modified biasing arrangements. The circuit may also be implemented using integrated circuit components that combine multiple discrete elements into a single package, or may utilize programmable logic devices that allow for flexible configuration of the control and power management functions.

[0117] Referring to FIG. 13 there is shown a flowchart of a method 1300 performed by the control circuitry of the kettle 1000 of FIG. 10a.

[0118] At step 1310, the method 1300 includes the control circuitry determining if the vessel 104 is supported on the base 106. In particular, the base power detection circuitry is configured to determine if a power signal is being received by the vessel 104 from the base 106. In one form, the power signal can be a 12 Volt signal. In response to a positive determination, the method 1300 proceeds to step 1330. In response to a negative determination, the method proceeds 1300 to step 1320.

[0119] At step 1320, the method 1300 includes powering the vessel lighting assembly 1010 of the vessel 104 using the power stored in the energy storage device 1106. This step can continue to be performed until the energy storage device 1106 has discharged to a certain point where the energy storage device 1106 has insufficient charge to power the light assembly. In a preferable form, the energy storage device 1106 has sufficient energy storage capacity to power the lighting assembly 1010 for approximately thirty seconds to one minute. Once the charge of the energy storage device 1106 has discharged, the vessel lighting assembly 1010 no longer emits light and the method ends. In addition, the base control circuitry 309 can control the base lighting assembly 250 to emit a reduced amount of light compared to when the vessel 104 is supported by the base 106. For example, the light emitted by the light may be dimmed by a predefined proportion of the maximum lighting (e.g., 50%) when the signal received by the base control circuitry from the NTC of the vessel is indicative of a zero voltage drop across the NTC, so as to provide visual feedback that the vessel 104 has been removed from the base 106. As discussed earlier, other sensors can be used to detect when the vessel has been removed from the base.

[0120] At step 1330, the method 1300 includes the control circuitry determining if the energy storage device 1106 is fully charged. If the energy storage device 1106 is fully charged, the method 1300 proceeds to step 1350. If the energy storage device 1106 is not fully charged, the method 1300 proceeds to steps 1340.

[0121] At step 1340, the method 1300 includes the control circuitry charging the energy storage device 1106. In one particular form, the charging of the energy storage device 1106can take approximately three seconds. The method 1300 loops between step 1340 and step 1330 until the energy storage device 1106 is fully charged and then proceeds to step 1350.

[0122] At step 1350, the method 1300 includes the control circuitry controlling the lighting assembly 250 using the power provided by the base power source. For example, the control circuitry may include a Pulse Width Modulation circuit which can control the amount of light emitted by the lighting assembly 250 to create various visual patterns and animations.

[0123] Referring to FIG. 14, there is shown a block diagram of a controller 1290 that may be implemented in the base control circuitry 309 or vessel control circuitry 1201. The controller 1290 includes a processor 1410, a memory 1420, a communication interface 1430, and an input / output interface 1440, all interconnected via a bus 1450.

[0124] The processor 1410 may be configured to execute instructions stored in the memory 1420 and perform computational operations for controlling various functions of the kitchen appliance 100. The processor 1410 may execute control algorithms for managing the heating element 114, monitoring temperature readings from the temperature sensor 723, controlling the illumination assembly 250, and coordinating the operation of the energy storage device 1106 and vessel lighting assembly 1010. The processor 1410 may be implemented as a microcontroller, microprocessor, digital signal processor, or other suitable processing device.

[0125] The memory 1420 may store program instructions, configuration parameters, and operational data used by the processor 1410. The memory 1420 may include volatile memory such as random access memory for temporary data storage during operation, and non-volatile memory such as flash memory or read-only memory for storing firmware, calibration data, and persistent configuration settings. The memory 1420 may store control algorithms for regulating the charging circuit 1104, managing the base power detection circuit 1102, and controlling the switching circuit 1108.

[0126] The communication interface 1430 may enable the controller 1290 to communicate with external devices and systems. The communication interface 1430 maysupport various wired communication protocols such as UART, SPI, or I2C for communicating with sensors, actuators, and other circuit components. In some cases, the communication interface 1430 may support wireless communication protocols such as Bluetooth, Wi-Fi, or other radio frequency communication standards, allowing the kitchen appliance 100 to connect with mobile devices, smart home systems, or cloud-based services.

[0127] The input / output interface 1440 may provide connectivity for receiving input signals and transmitting output signals. The input / output interface 1440 may be configured to receive signals from the temperature sensor 723, user interface devices on the interface panel 254, and the base power detection circuit 1102. The input / output interface 1440 may also transmit control signals to the illumination assembly 250, the heating element 114, and the switching devices Ml and M2. The input / output interface 1440 may include analog-to-digital converters for processing analog sensor signals, digital-to-analog converters for generating analog control signals, and digital input / output pins for interfacing with digital devices.

[0128] The bus 1450 may serve as a communication pathway that facilitates data transfer between the processor 1410, memory 1420, communication interface 1430, and input / output interface 1440. The bus 1450 may be implemented as a parallel bus, serial bus, or combination thereof, and may support various bus protocols for coordinating access to shared resources and ensuring reliable data transmission between connected components.

[0129] Whilst in certain examples a single light pipe is shown, it will be appreciated that one or more light pipe sections or components can be used to form the light pipe. For example, two light pipe halve components, three light pipe third components, four light pipe quarter components, etc can be assembled together to form the light pipe. It will be appreciated that in this embodiment, the light pipe may have not have any ribs (such as FIG. 4c) or may include ribs (such as FIG. 4a). Advantageously, the modular design of the light pipe components allows for easier manufacturing and assembly, reducing production complexity and costs. The ability to use multiple components also provides flexibility in adapting the light pipe design to different vessel sizes and configurations.

[0130] It will also be appreciated that the kitchen appliance 100 can include a plurality of light pipes. The plurality of light pipes may be separate and not assembled together. When the vessel is supported by the base, the plurality of light pipes are positioned to receive and transmit light emitted from the illumination assembly. Advantageously, multiple light pipes can provide more uniform light distribution throughout the vessel, ensuring consistent illumination of the substance contained therein. This configuration also allows for redundancy in the lighting system, where if one light pipe becomes damaged or obstructed, the remaining light pipes can continue to provide illumination functionality.

[0131] In some embodiments, the kitchen appliance 100 may be configured as various types of appliances beyond kettles. For example, the vessel 104 may be configured as a blender jar, wherein the substance 108 comprises ingredients to be blended, and the base 106 includes a motor and blade assembly for blending operations. In another form, the vessel 104 may be configured as a food processor bowl, wherein the light pipe 110 allows users to observe the processing of food ingredients contained therein. The vessel 104 may also be configured as a slow cooker pot, wherein the illumination through the light pipe 110 enables monitoring of cooking progress without removing the lid 120. In some cases, the vessel 104 may be configured as a soup maker container, wherein the light pipe 110 provides visibility of the soup preparation process. The vessel 104 may also be configured as a milk frother jug, wherein the light pipe 110 allows observation of the frothing process. In another embodiment, the vessel 104 may be configured as a tea infuser vessel, wherein the light pipe 110 enables users to monitor the steeping process. The vessel 104 may also be configured as a hot chocolate maker container, wherein the illumination facilitates observation of the mixing and heating process. In some aspects, the vessel 104 may be configured as a baby bottle warmer receptacle, wherein the light pipe 110 provides visual indication of the warming process. The modular nature of the light pipe 110 and illumination assembly 250 allows for adaptation to various kitchen appliance configurations while maintaining the benefits of improved visibility, ease of cleaning, and aesthetic appeal.

[0132] In some embodiments, the vessel 104 may include one or more light-transmitting windows positioned along the one or more side walls 116 to allow light from the light pipe 110 to be visible externally. The light-transmitting windows may be formed from transparent or translucent materials such as glass, polycarbonate, acrylic, or other suitable materials that permit light transmission while maintaining structural integrity. The windows may be integrally formed with the side walls 116 or may be separately manufactured components that are subsequently attached or embedded within the side walls 116. In some cases, the lighttransmitting windows may be positioned at predetermined locations along the side walls 116 to correspond with specific features of the light pipe 110, such as the locations of the ribs 112 or other light-emitting regions. The windows may have various shapes including circular, rectangular, oval, or irregular geometric patterns, and may be arranged in patterns such as vertical strips, horizontal bands, or scattered distributions around the circumference of the vessel 104.

[0133] In some embodiments, the light pipe 110 may be integrally formed with the one or more side walls 116 of the vessel 104. The integral formation may be achieved through various manufacturing processes such as injection molding, blow molding, or other suitable techniques that allow the light pipe 110 and side walls 116 to be formed as a single continuous structure. This integral construction may provide enhanced structural integrity, reduced manufacturing complexity, and improved light transmission characteristics by eliminating interfaces between separate components. The material used for the integrally formed light pipe 110 and side walls 116 may be selected to provide appropriate light transmission properties while also meeting requirements for thermal resistance, mechanical strength, and food safety. In some cases, the material may be a transparent or translucent polymer such as polycarbonate, acrylic, or specialized glass materials that can withstand the temperatures and conditions associated with the intended use of the kitchen appliance 100.

[0134] In some embodiments, the one or more ribs 112 may be arranged in a radial pattern around a central axis of the vessel 104. The radial arrangement may provide uniform light distribution throughout the vessel 104 by positioning the ribs 112 at regular angularintervals around the central axis. For example, the ribs 112 may be spaced at equal angular increments such as every 30 degrees, 45 degrees, or 60 degrees around the circumference of the vessel 104. The radial pattern may facilitate consistent illumination of the substance 108 regardless of the rotational orientation of the vessel 104 on the base 106. In some cases, the number of ribs 112 in the radial pattern may be selected based on factors such as the desired illumination intensity, the size of the vessel 104, and the power output of the illumination assembly 250. The radial arrangement may also provide structural benefits by distributing mechanical loads evenly around the vessel 104 and enhancing the overall rigidity of the light pipe 110 structure.

[0135] In some embodiments, the illumination assembly 250 may include multiple light sources positioned at different locations around the base 106. The multiple light sources may be independently controllable to create various lighting effects such as sequential activation, color changes, or intensity variations. The light sources may include LEDs of different colors, allowing the illumination assembly 250 to produce multi-colored lighting effects that can indicate different operational states or provide aesthetic appeal. In some cases, the base control circuitry 309 may be configured to control the multiple light sources according to predetermined patterns or in response to user inputs received through the interface panel 254. The multiple light sources may be positioned to align with different portions of the light pipe 110, allowing selective illumination of specific regions of the vessel 104.

[0136] In some embodiments, the light pipe 110 may include surface texturing or optical features configured to enhance light distribution or create specific visual effects. The surface texturing may include patterns such as prismatic structures, diffusion features, or reflective coatings that modify the propagation of light through the light pipe 110. In some cases, the optical features may be designed to scatter light in predetermined directions, creating uniform illumination throughout the vessel 104 or concentrating light in specific regions. The surface texturing may be applied to the inner surface, outer surface, or both surfaces of the light pipe 110, and may vary in density or pattern along the length of the light pipe 110 to achieve desired illumination characteristics.

[0137] In some embodiments, the textured surface of the light pipe 110 may include microstructures configured to modify light propagation characteristics. The microstructures may be formed on outer or inner surfaces and may include pyramidal projections, hemispherical protrusions, cylindrical posts, or elongated ridges with dimensions ranging from approximately 10 to 500 micrometers. The microstructures may be arranged in regular or irregular patterns and oriented at specific angles to achieve desired scattering or reflection characteristics.

[0138] The textured surface may include different microstructure types distributed across different regions of the light pipe 110. Regions closer to the annular structure 400 may include higher density microstructures for greater light scattering, while regions farther away may include lower density microstructures for more direct light transmission. Microstructure density may range from approximately 100 to 10,000 microstructures per square millimeter.

[0139] In some embodiments, the textured surface may include prismatic structures arranged in linear arrays or concentric patterns with triangular, trapezoidal, or polygonal cross-sectional profiles. The prismatic structures may extend parallel or perpendicular to the central axis 304 and may be configured to redirect light through total internal reflection.

[0140] The textured surface may include diffusion features configured to scatter light in multiple directions. The diffusion features may include randomly distributed surface irregularities created through surface treatments such as chemical etching, sandblasting, laser ablation, or molding processes that impart controlled roughness to the surface.

[0141] In some embodiments, the textured surface may include lenticular features comprising elongated cylindrical or semi-cylindrical lens elements. The lenticular features may be oriented vertically, horizontally, or at oblique angles and may be configured to focus or defocus light passing through the light pipe 110, creating regions of varying light intensity.

[0142] The textured surface may include faceted structures with alternating refractive and reflective surfaces to control light distribution. The reflective surfaces may be created through metallic films, dielectric coatings, or total internal reflection surfaces.

[0143] In some embodiments, the textured surface may include gradient features wherein surface texture characteristics vary along the length of the light pipe 110. For example, microstructure density may decrease from the annular structure 400 toward the rim 414, creating a gradient that promotes uniform light distribution by compensating for natural light attenuation.

[0144] The textured surface may include wavelength-selective features configured to preferentially scatter or transmit light of specific wavelengths. The microstructure dimensions may be selected to correspond to wavelengths emitted by the illumination assembly 250 to achieve efficient scattering and create color-dependent lighting effects.

[0145] In some embodiments, the textured surface may be formed through injection molding processes or post-molding processes such as laser ablation, chemical etching, sandblasting, or bead blasting. The texture may be imparted during molding using textured mold cavities or created after molding using controlled material removal processes.

[0146] The textured surface may include hierarchical structures comprising multiple levels of texture at different size scales, from macroscopic features to nanoscopic features. The hierarchical structures may provide enhanced light scattering and distribution by interacting with light at multiple spatial scales.

[0147] In some embodiments, the textured surface may include periodic structures configured to create diffraction effects. The periodic structures may split light into multiple beams propagating in different directions, creating enhanced light distribution throughout the vessel 104 and specific diffraction patterns for aesthetic appearance.

[0148] The textured surface may include light extraction features configured to promote light extraction from the light pipe 110 at specific locations. The light extraction features may include surface disruptions that break total internal reflection conditions and may be distributed according to predetermined patterns to create desired illumination distributions.

[0149] In some embodiments, the textured surface may be configured to create specific angular distributions of scattered light, ranging from predominantly forward scattering towide-angle scattering. The angular distribution may be controlled by selecting appropriate microstructure geometries, dimensions, and spatial distributions.

[0150] The textured surface may include coupling-enhancement features configured to enhance light coupling from the illumination assembly 250 into the light pipe 110. These features may include anti -refl ection structures such as moth-eye structures to reduce Fresnel reflection losses and increase light entry into the light pipe 110.

[0151] In some embodiments, the textured surface may be combined with surface coatings that modify optical properties of the light pipe 110. The coatings may include reflective metallic films, dielectric multilayer coatings, or phosphorescent / fluorescent materials that provide wavelength conversion effects to enhance aesthetic appearance or functionality.

[0152] In some embodiments, the vessel 104 may include multiple light pipes positioned at different locations around the vessel 104. The multiple light pipes may be configured to receive light from the same illumination assembly 250 or from separate illumination assemblies positioned at different locations on the base 106. The multiple light pipes may have different configurations, such as different rib patterns, different lengths, or different optical properties, to create varied lighting effects throughout the vessel 104. In some cases, the multiple light pipes may be positioned to illuminate different regions of the vessel 104, such as the bottom portion, middle portion, and upper portion, providing comprehensive visibility of the substance 108 at all fill levels.

[0153] In some embodiments, the base 106 may include sensors configured to detect the fill level of the substance 108 within the vessel 104. The sensors may include optical sensors, capacitive sensors, or other suitable sensing technologies that can determine the quantity of substance 108 present. The base control circuitry 309 may be configured to adjust the operation of the illumination assembly 250 based on the detected fill level, such as by illuminating only the portions of the light pipe 110 that are adjacent to the substance 108 or by changing the color or intensity of the illumination to indicate different fill levels. Thisfunctionality may provide enhanced user feedback and may help prevent overfilling or underfilling of the vessel 104.

[0154] In some embodiments, the vessel lighting assembly 1010 may include multiple lighting elements positioned at different locations within the vessel 104. The multiple lighting elements may be configured to provide redundant illumination capability, ensuring that the vessel 104 remains illuminated even if one or more lighting elements fail. The multiple lighting elements may also be positioned to provide more uniform illumination throughout the vessel 104 by distributing light sources at strategic locations. In some cases, the vessel control circuitry 1201 may be configured to selectively activate different lighting elements based on factors such as the remaining charge in the energy storage device 1106, the detected fill level of the substance 108, or user preferences.

[0155] In some embodiments, the energy storage device 1106 may include a rechargeable battery such as a lithium-ion battery, lithium-polymer battery, or other suitable battery technology. The rechargeable battery may provide extended illumination duration compared to capacitor-based energy storage devices, allowing the vessel lighting assembly 1010 to remain operational for longer periods after the vessel 104 is removed from the base 106. The vessel control circuitry 1201 may include battery management circuitry configured to monitor the state of charge, temperature, and health of the rechargeable battery, and to implement charging protocols that optimize battery life and safety. In some cases, the rechargeable battery may have sufficient capacity to power the vessel lighting assembly 1010 for multiple minutes or even hours after removal from the base 106.

[0156] In some embodiments, the vessel 104 may include a manual switch or button that allows the user to control the operation of the vessel lighting assembly 1010. The manual switch may allow the user to turn the vessel lighting assembly 1010 on or off independently of the automatic control provided by the vessel control circuitry 1201. In some cases, the manual switch may allow the user to select different lighting modes such as continuous illumination, pulsing illumination, or color-changing illumination. The manual switch may bepositioned at a convenient location on the vessel 104 such as on the handle 124 or near the opening 118, allowing easy access during use.

[0157] In some embodiments, the base 106 and vessel 104 may include wireless communication capabilities that allow data exchange without requiring physical electrical connections. The wireless communication may be implemented using technologies such as Bluetooth, Wi-Fi, near-field communication (NFC), or other suitable wireless protocols. The wireless communication may allow the base control circuitry 309 to transmit control signals to the vessel control circuitry 1201, such as commands to activate the vessel lighting assembly 1010 or to adjust the illumination characteristics. The wireless communication may also allow the vessel control circuitry 1201 to transmit status information to the base control circuitry 309, such as the charge level of the energy storage device 1106 or the operational state of the vessel lighting assembly 1010. This wireless functionality may provide enhanced flexibility in the design and operation of the kitchen appliance 100.

[0158] In some embodiments, the light pipe 110 may include optical fibers or light guides that extend from the annular structure 400 along the side walls 116 of the vessel 104. The optical fibers may be embedded within the material of the side walls 116 or may be attached to the inner or outer surfaces of the side walls 116. The optical fibers may provide efficient light transmission with minimal loss, allowing light from the illumination assembly 250 to be distributed throughout the vessel 104 with high efficiency. In some cases, the optical fibers may terminate at specific locations along the side walls 116, creating discrete illuminated points or regions that provide visual interest and functional illumination.

[0159] In some embodiments, the vessel 104 may include a removable light pipe assembly that can be detached from the vessel 104 for cleaning or replacement. The removable light pipe assembly may include the light pipe 110 and associated mounting hardware, and may be configured to engage with corresponding mounting features on the vessel 104 through snap-fit connections, threaded engagement, or other suitable attachment mechanisms. The removable design may facilitate thorough cleaning of both the light pipe 110 and the vessel 104, and may allow replacement of the light pipe 110 if it becomesdamaged or if a different light pipe configuration is desired. In some cases, different light pipe assemblies with varying optical characteristics or aesthetic designs may be available, allowing users to customize the appearance and functionality of the kitchen appliance 100.

[0160] In some embodiments, the illumination assembly 250 may include ambient light sensors configured to detect the lighting conditions in the surrounding environment. The base control circuitry 309 may be configured to adjust the intensity or color of the illumination assembly 250 based on the detected ambient light levels. For example, in low ambient light conditions such as during nighttime use, the base control circuitry 309 may reduce the intensity of the illumination assembly 250 to avoid excessive brightness that could be uncomfortable to users. Conversely, in bright ambient light conditions, the base control circuitry 309 may increase the intensity of the illumination assembly 250 to ensure adequate visibility of the substance 108 within the vessel 104. This adaptive illumination functionality may enhance user comfort and may contribute to energy efficiency by avoiding unnecessary high-intensity illumination when not needed.

[0161] In some embodiments, the kitchen appliance 100 may include voice control capabilities that allow users to control various functions through spoken commands. The base 106 may include a microphone and voice recognition circuitry configured to receive and interpret voice commands from users. The voice commands may include instructions to activate or deactivate heating, adjust temperature settings, control the illumination assembly 250, or query the status of the appliance. The voice control functionality may be implemented using local voice recognition algorithms executed by the base control circuitry 309, or may utilize cloud-based voice recognition services accessed through wireless network connectivity. The voice control capabilities may provide enhanced convenience and accessibility, particularly for users with limited mobility or visual impairments.

[0162] In some embodiments, the vessel 104 may include temperature-sensitive materials or coatings that change color or appearance in response to temperature changes. The temperature-sensitive materials may be applied to the exterior surface of the vessel 104 or may be incorporated into the light pipe 110 or side walls 116. The color changes mayprovide visual indication of the temperature of the substance 108 contained within the vessel 104, allowing users to quickly assess whether the substance 108 is hot, warm, or cool without requiring electronic displays or sensors. The temperature-sensitive materials may include thermochromic pigments, liquid crystals, or other materials that exhibit reversible color changes in response to temperature variations. This passive temperature indication functionality may complement the electronic temperature sensing and display capabilities of the kitchen appliance 100.

[0163] In some embodiments, the base 106 may include inductive charging capabilities configured to wirelessly charge the energy storage device 1106 of the vessel 104. The inductive charging may be implemented using electromagnetic induction between a transmitter coil in the base 106 and a receiver coil in the vessel 104. The inductive charging may eliminate the need for direct electrical contacts between the base electrical engaging portion 200 and the vessel electrical engaging portion 202, potentially improving reliability and reducing wear on electrical connectors. The inductive charging system may be configured to provide sufficient power for both charging the energy storage device 1106 and operating the heating element 114 simultaneously, or may be configured to prioritize charging when the heating element 114 is not in use. The base control circuitry 309 may monitor the charging process and adjust the power transfer to optimize charging efficiency and protect the energy storage device 1106 from overcharging.

[0164] In some embodiments, the light pipe 110 may include phosphorescent or fluorescent materials that absorb light from the illumination assembly 250 and continue to emit light for a period of time after the illumination assembly 250 is deactivated. The phosphorescent or fluorescent materials may be incorporated into the material of the light pipe 110 or may be applied as coatings on the surfaces of the light pipe 110. This afterglow effect may provide continued visibility of the vessel 104 contents for a short period after the vessel 104 is removed from the base 106, even before the vessel lighting assembly 1010 activates or after the energy storage device 1106 has been depleted. The duration andintensity of the afterglow may be selected based on the specific phosphorescent or fluorescent materials used and their concentration within the light pipe 110.

[0165] In some embodiments, the kitchen appliance 100 may include connectivity features that allow integration with smart home systems or mobile device applications. The base 106 may include wireless communication modules such as Wi-Fi, Bluetooth, or Zigbee transceivers that enable communication with external devices and networks. Users may be able to control the kitchen appliance 100 remotely through a mobile application, including functions such as starting or stopping heating operations, adjusting temperature settings, monitoring the current status, and controlling the illumination assembly 250. The mobile application may also provide notifications to users regarding the operational status of the kitchen appliance 100, such as alerts when water has reached the target temperature or when the energy storage device 1106 requires charging. The connectivity features may also enable firmware updates to be delivered to the base control circuitry 309 and vessel control circuitry 1201, allowing new features or improvements to be added over the lifetime of the product.

[0166] In some embodiments, the vessel 104 may include a graduated scale or measurement markings that are illuminated by the light pipe 110 to facilitate accurate measurement of the substance 108. The measurement markings may be formed by selectively blocking or enhancing light transmission at specific locations along the light pipe 110, creating illuminated lines or indicators that correspond to specific volume measurements. The illuminated measurement markings may be more easily visible than conventional printed or etched markings, particularly in low ambient light conditions. In some cases, the base control circuitry 309 may be configured to selectively illuminate different portions of the light pipe 110 to highlight specific measurement markings, such as illuminating only the portion of the light pipe 110 up to a target fill level to guide users during filling operations.

[0167] In this specification, adjectives such as first and second, left and right, top and bottom, and the like may be used solely to distinguish one element or action from another element or action without necessarily requiring or implying any actual such relationship or order. Where the context permits, reference to an integer or a component or step (or the like)is not to be interpreted as being limited to only one of that integer, component, or step, but rather could be one or more of that integer, component, or step etc.

[0168] The above description of various embodiments of the present invention is provided for purposes of description to one of ordinary skill in the related art. It is not intended to be exhaustive or to limit the invention to a single disclosed embodiment. As mentioned above, numerous alternatives and variations to the present invention will be apparent to those skilled in the art of the above teaching. Accordingly, while some alternative embodiments have been discussed specifically, other embodiments will be apparent or relatively easily developed by those of ordinary skill in the art. The invention is intended to embrace all alternatives, modifications, and variations of the present invention that have been discussed herein, and other embodiments that fall within the spirit and scope of the abovedescribed invention.

[0169] In this specification, the terms 'comprises', 'comprising', 'includes', 'including', or similar terms are intended to mean a non-exclusive inclusion, such that a method, system, or apparatus that comprises a list of elements does not include those elements solely but may well include other elements not listed.

[0170] It should be appreciated that the term connected, when used in the claims, should not be interpreted as being limited to direct connections only. The terms "coupled" and "connected," along with their derivatives, may be used. It should be understood that these terms are not intended as synonyms for each other. Thus, the scope of the expression a device A connected to a device B should not be limited to devices or systems wherein an output of device A is directly connected to an input of device B. It means that there exists a path between an output of A and an input of B which may be a path including other devices or means. "Connected" may mean that two or more elements are either in direct physical contact, or that two or more elements are not in direct contact with each other but yet still cooperate or interact with each other, unless otherwise specified.

[0171] The reference in this specification to any known matter or any prior publication is not, and should not be taken to be, an acknowledgment or admission or suggestion that theknown matter or prior art publication forms part of the common general knowledge in the field to which this specification relates.

[0172] While specific examples of the invention have been described, it will be understood that the invention extends to alternative combinations of the features disclosed or evident from the disclosure provided herein.

[0173] Many and various modifications will be apparent to those skilled in the art without departing from the scope of the invention disclosed or evident from the disclosure provided herein.Reference Numerals100 kitchen appliance102 vessel assembly104 vessel106 base108 substance110 light pipe112 rib114 heating element116 side wall118 opening119 upper rim120 lid122 lever124 handle140 mounting bracketbase electrical engaging portion vessel electrical engaging portion base section midsection upper section vessel lighting assembly textured base surface interface panel control dial control button increment temperature button decrement temperature button start button stop button display device light emitting portion upper surface central axis electrical wiring circuit board base control circuitry annular structure end portionelbow portion downwardly directed elbow portion well heater module adhesive textured rim opaque backing medium mounting hole cavity light path inward projection light transmission path tapered end inner surface light beam light direction support surface scalloped section central axis light transmission path electrical cable electrical outlet live line06 neutral line 08 earth line 10 UI board 12 power board 14 live connector 16 neutral connector 18 earth connector 20 temperature sensor connector 22 lighting connector 23 temperature sensor 00 espresso machine 01 hopper 02 housing 04 collar 50 coffee grinder 00 hopper wall 02 hopper neck 04 hopper opening 06 hopper lid908 opening rim1000 kettle1010 vessel lighting assembly1100 lighting control system1102 base power detection circuit1104 charging circuit1106 power storage device1108 switching circuit1110 base power source1201 vessel control circuitry1202 charging circuit1203 darlington transistor circuit1204 first transistor1205 second transistor1206 mosfet transistor1290 controller1291 control signal1300 method1310 step1320 step1330 step1340 step1350 step1500 lightC 1 first capacitorC2 storage capacitorC3 third capacitorC4 fourth capacitorDI first diodeD2 second diodeD3 third diodeD4 fourth diodeD5 fifth diodeD7 seventh diodeMl first switching deviceM2 second switching deviceQI first transistorQ2 second transistorQ3 third transistorQ4 fourth transistorR1 first resistorR2 second resistorR3 third resistorR4 fourth resistorR5 fifth resistorR6 sixth resistorR7 seventh resistorR8 eighth resistorRIO tenth resistorR11 eleventh resistorR12 twelfth resistorV 1 first voltage nodeVI 2 supply voltage node

Claims

CLAIMS1. A kitchen appliance including: a vessel for containing a substance, wherein the vessel includes a light pipe that extends from a bottom portion of the vessel along a portion of one or more side walls of the vessel; and a base configured to removably support the vessel, wherein the base includes an illumination assembly; wherein when the vessel is supported by the base, the light pipe is positioned adjacent to the illumination assembly to receive and transmit light emitted therefrom.

2. The kitchen appliance of claim 1, wherein the light pipe includes one or more ribs, wherein each rib has an elbow profile.

3. The kitchen appliance of claim 2, wherein the elbow profile of each rib is configured to redirect light received in a first direction substantially orthogonal to a central axis of the base into a second direction substantially parallel to the central axis to illuminate the side walls along their length.

4. The kitchen appliance of claim 3, wherein each rib includes a first portion extending substantially orthogonal to the central axis of the base, and a second portion extending toward an opening of the vessel, wherein at least some of the light received via the first portion is internally reflected along a path which is substantially parallel with an inner surface of the second portion which faces the bottom portion of the vessel.

5. The kitchen appliance of claim 4, wherein the light pipe includes an annular structure which the one or more ribs extend therefrom, wherein the light emitted from the illumination assembly is received by the annular structure which then transfers the light to the one or more ribs.

6. The kitchen appliance of claim 5, wherein the annular structure and ribs are configured to distribute light circumferentially around the vessel to provide uniform illumination of the substance7. The kitchen appliance of any one of claims 2 to 6, wherein the one or more ribs are arranged in a radial pattern around a central axis of the vessel.

8. The kitchen appliance of any one or claims 1 to 7, wherein the illumination assembly is a strip of light emitting diodes.

9. The kitchen appliance of any one of claims 1 to 8, wherein at least a light emitting portion of the illumination assembly is mounted at or adjacent to a support surface of the base.

10. The kitchen appliance of claim 9, wherein the light emitting portion is mounted to emit light substantially orthogonal to a central axis of the base.

11. The kitchen appliance of any one of claims 1 to 10, wherein the kitchen appliance is a kettle appliance.

12. The kitchen appliance of claim 11, wherein the base is electrically connectable to an electrical power source, wherein the base includes a base electrical engaging portion which is configured to cooperate with a vessel electrical engaging portion to electrically power a heating element of the vessel.

13. The kitchen appliance of claim 12, wherein an opaque backing medium is secured to the light pipe, wherein the opaque backing medium is configured to obscure the heating element being visible outside the vessel.

14. The kitchen appliance of claim 12 or 13, wherein at least some of the light pipe is positioned between the heating element and the one or more side walls to obscure the heating element from external view while transmitting light along the side walls.

15. The kitchen appliance of any one of claims 1 to 10, wherein the kitchen appliance is a coffee grinder and the substance is coffee beans, wherein the vessel is a coffee bean hopperand the base is a housing including a grinding mechanism and a collar to releasably receive the hopper, wherein the illumination assembly is mounted to the collar.

16. The kitchen appliance of any one of claims 1 to 10, wherein the kitchen appliance is an espresso machine including an integrated coffee grinder and the substance is coffee beans, wherein the vessel is a coffee bean hopper and the base is a housing including a grinding mechanism and a collar to releasably receive the hopper, wherein the illumination assembly is mounted to the collar.

17. The kitchen appliance of any one of claims 1 to 16, wherein the vessel includes a plurality of light pipes, wherein when the vessel is supported by the base, the plurality of light pipes are positioned to receive and transmit light emitted from the illumination assembly.

18. The kitchen appliance of any one of claims 1 to 17, wherein the vessel includes an electrical energy storage device in electrical communication with a vessel lighting assembly, wherein the electrical energy storage device and the vessel lighting assembly are fluidically sealed within the vessel, and wherein the electrical energy storage device is configured to electrically charge whilst the vessel is in electrical communication with the base and electrically discharge to operate the vessel lighting assembly when the vessel is removed from the base.

19. The kitchen appliance of claim 18, wherein the vessel lighting assembly is positioned to emit light through the light pipe when powered by the electrical energy storage device.

20. The kitchen appliance of claim 18 or 19, wherein the electrical energy storage device has sufficient energy storage capacity to power the vessel lighting assembly for at least thirty seconds after the vessel is removed from the base.

21. The kitchen appliance of any one of claims 1 to 20, wherein the base includes base control circuitry configured to reduce an amount of light emitted by the illumination assembly when the vessel is removed from the base.

22. The kitchen appliance of any one of claims 1 to 21, wherein the light pipe is integrally formed with the one or more side walls of the vessel.

23. The kitchen appliance of any one of claims 1 to 22, wherein the light pipe comprises a passive optical element without electrical components, such that the vessel is cleanable by immersion in water or placement in a dishwasher.

24. The kitchen appliance of any one of claims 1 to 23, wherein the one or more side walls are formed from transparent or translucent material to allow light transmitted by the light pipe to be visible externally.

25. The kitchen appliance of any one of claims 1 to 24, wherein the vessel is removable from the base without disconnecting any electrical connections to the light pipe.

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