Chemical Sensor Timer for Battery-Free Expiration Monitoring
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Solution Overview
Problem
Existing timer devices for monitoring expiration dates of pharmaceuticals and food products often require a battery or power source, limiting their usability in applications where a passive, battery-free solution is desired.
Innovation Solution
A timer device comprising a timer chamber with a conditioning material and a sensor that indicates elapsed time based on a threshold level of a timer chemical or humidity, using adsorption/desorption characteristics to reach a predetermined state within a set time, allowing for battery-free operation and flexible integration into labels or product dispensers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a battery or power source is used in timer devices, then the timer can provide active electronic timing functions, but the device complexity and power requirements increase
Solution Approach 1:
The timer device utilizes the chemical reactions and phase changes of materials within the package itself to generate timing signals, eliminating the need for external power sources. The system serves itself by using the product's own chemical properties (temperature changes, concentration gradients) as the timing mechanism, thereby removing batteries and power management components.
Solution Approach 2:
The patent replaces electronic timing mechanisms with chemical and physical processes. Instead of using electronic circuits and power sources, the timer uses chemical reactions, phase changes, and mass transport phenomena to create visible timing indicators, substituting mechanical/chemical systems for electronic ones.
2Device complexity
If passive elapsed time indicators are used, then the device complexity is reduced and no power source is needed, but the measurement precision and reliability may be compromised
Solution Approach 1:
The timer device exploits changes in physical and chemical parameters (temperature, concentration, phase state) of materials within the package over time. By monitoring these parameter changes through visible indicators, the system achieves precise timing measurements without electronic components. The timing accuracy is derived from the predictable kinetics of chemical reactions and phase transitions.
Solution Approach 2:
The patent employs color-changing materials and indicators that visually signal the passage of time. Chemical indicators change color in response to pH changes, oxidation-reduction reactions, or complexation reactions, providing clear, precise timing information through optical changes that are easily observable and can be correlated to specific time points.
3Manufacturing precision
If rigid timer devices are used, then manufacturing precision can be maintained, but the adaptability to different package shapes and sizes is limited
Solution Approach 1:
The timer device utilizes flexible packaging materials and thin-film structures that can conform to various package shapes and sizes. The timing mechanism is integrated into the flexible packaging itself, allowing the timer to adapt to different container geometries while maintaining manufacturing precision through controlled material properties and reaction kinetics.
Solution Approach 2:
The timer system is designed with universal applicability across different package types, sizes, and product categories. The chemical and physical principles underlying the timing mechanism are independent of package geometry, allowing the same fundamental design to be adapted to diverse applications from small pouches to large containers while maintaining timing accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables a passive, battery-free timer device that accurately indicates elapsed time, suitable for various applications, including pharmaceuticals and food products, with flexible and reusable designs that maintain accuracy over extended periods.
Implementation Method 1
the timer chamber conditioning material has a predetermined adsorption/desorption characteristic with respect to a timer chemical
Implementation Method 2
a humidity conditioning material disposed within the timer chamber and arranged to adsorb or desorb water vapor from a headspace of the timer chamber
Implementation Method 3
a sensor arranged to sense a timer chemical within the timer chamber
Implementation Method 4
a timer chamber initialization structure configured to open and/or close the timer chamber
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
An elapsed timer device includes a timer element comprising a timer chamber, a timer chamber conditioning material disposed within the timer chamber, and a sensor arranged to sense a timer chemical within the timer chamber. The sensor indicates elapsed time in response to a threshold level of the chemical being present within the timer chamber. The timer chamber, timer chemical adsorption/desorption characteristics of the timer chamber conditioning material, and the sensor are configured so that an amount of the timer chemical within the timer chamber reaches the threshold level within a predetermined time after initialization of the timer element.