41results about How to "Minimizes shrinkage" patented technology

The present invention relates to a method of using non-macrogelled polymer-solvent combinations to form devices, in particular medical devices and/or cosmetic devices, more specifically contact lenses. The method of using polymer solvent combinations is suitable for forming useful 3D dimensionally stable structures which may include curved surfaces, which may be significantly different to those curved surfaces achieved by using simple meniscus effects.

An authentication system using a correlator that correlates an input with a reference wherein at least one of the input and reference comprises a phase volume mask having structures, preferably points, that are each less than about six microns in size and can have an aspect ratio (AR) greater than 1:1 so as to produce a phase encoded random pattern having millions of combinations in a mask that is as small as one square millimeter. The random pattern can be convolved with a second pattern, such as a biometric pattern, to produce a phase convolved mask. The correlator preferably is a nonlinear joint transform correlator that can use “chirp” encoding to permit the input to be located in a different plane than the reference. The correlator optically Fourier transforms images of the reference and input that are thereafter nonlinearly transformed and inverse Fourier transformed by a processor to determine the presence or absence of a correlation spike indicative of authenticity. A spatial light modulator (SLM) can be used as an input or reference and preferably is a liquid crystal panel having pixels or elements whose phase or grey scale intensity can be selectively controlled by a processor. The SLM can be used to display a biometric pattern, preferably scanned in real time from a person, that is correlated against an input or reference that can comprise a label on a card, a tag, or another object.

A medical balloon for a balloon catheter is described. The balloon has at least a first layer made from a first material and a second layer made from a second material, said first and second layers being in overlying relationship with one another and being integral with one another; wherein the first layer has a softening or melting temperature which is higher than a softening or melting temperature of the second layer. A method of forming the medical balloon is also described, including locating a raw tubing in a mold; preheating and inflating the raw tubing so as to cause it to stretch; heating the raw tubing to soften or melt the second layer; setting the inflated raw tubing to form the medical balloon; and cooling the set balloon.

A capacitive sensor includes one or more chambers through which a material can flow. Two conductors are located to partially surround the flow chamber so that the material flows between the conductors. Where more than one chamber is used, additional conductors are provided. A measurement circuit connected to the conductors provides an output corresponding to a difference between test and reference frequencies. A display indicates the measured capacitance as a continuous-scale, proportional representation or a binary representation. The sensor system can measure volume charge density of a fluid or parameters responsive to changes in volume charge density, such as flow velocity.

A water based binder for use in a slurry for investment casting. The binder includes a mixture of a colloidal silica sol and at least one latex polymer. The latex polymer is preferably an acrylic latex or a styrene butadiene polymer (or a combination of these) which reduces the processing time between dips during shell mold making for investment casting. The latex polymer further lowers a critical concentration point or gelation point of the colloidal silica sol. The binder may be used as a primary binder or a backup binder in the shell mold making process. To make the slurry, the binder is combined with at least one refractory powder, preferably a refractory powder selected from the group of: alumino-silicates, fused silica, quartz silica, alumina, zircon, and zirconia.

Hydrophilic compositions are described, which are prepared from a first component oligomer containing pendent hydrophilic groups and pendent reactive functional groups capable of reaction at effective rates (at normal processing temperatures), with a co-reactive second component possessing functionality that is complementary to that of the first oligomer. The compositions may be used as in preparation of hydrophilic gel coatings or layers for medical devices.

A coating method is a method for forming a multilayer coating film including at least one lower layer formed on a substrate and an uppermost layer formed on the lower layer, and the coating method comprises the steps of: preparing a certain curable coating material as an uppermost layer-coating material for forming the uppermost layer, and preparing a certain coating material as at least one lower layer-coating material for forming the lower layer; forming an uncured multilayer coating film by applying the lower layer-coating material and the uppermost layer-coating material on the substrate using a wet-on-wet technique; and curing at least the uppermost layer-coating material by subjecting the uncured multilayer coating film to a curing treatment.

An indicator for indicating displacement of a controller displaceable about an axis angled to vertical direction: the indicator comprising an epicyclical gear comprising a sun gear, a planetary gear and an annular gear; the sun gear being coaxial with the annular gear; the annular gear being asymmetrically weighted to be self rightening by gravity; the sun gear being fixable to the controller and serving as a driving gear; the planetary gear being driven around the inside of the annular gear by the sun gear, wherein a centre of the planetary gear serves as a pointer and a reference indication is fixed to the annular gear such that relative position of pointer with respect to reference indication indicates displacement of the controller about its axis.

A wireless communication terminal includes: an array antenna; a MAC processing section, provided to detect a first order system, that interprets information on a quiet period that the base station has informed of the MAC processing section in advance and generates a quiet period signal; a synthesizing section that weights signals received by antennas of the array antenna by using weighting coefficients, and combines the signals to produce a synthetic signal; and an array antenna control section that optimizes the weighting coefficients so as to reduce an interference signal received from the array antenna, over a period of presence of the quiet period signal. The optimized weighting coefficients are applied while downstream signals from the base station are being received, but are not applied while the primary usage system is being detected.

This invention relates to a device that provides controlled release of a fragrant or deodorizing substance: the fragrant or deodorizing substance being solublized with an appropriate carrier solvent within a polymeric matrix. The layers function as protective barriers, semi-permeable membranes, fragrance reservoirs, and adhesives. The device is capable of delivering a fragrance at a controlled rate for a prolonged period of time through the gradual diffusion and release of fragrant material carried by a solvent from a reservoir system to the semi-permeable UV curable, oligomer composition acting a fragrance release regulator. Additionally, the UV curable, oligomeric composition that forms the reservoir and regulating layer can be engineered to be adhesive through cure inhibition. The method of cure inhibition can also be utilized to create internal areas of high and low cross link density to further control the release rate of a fragrance.

The invention relates to a method for producing a plastic housing, where at least one first plastic housing part with at least one guide or bearing for at least one mechanically movable component, in particular a sensor, is produced in a first molding step, the at least one first plastic housing part is overmolded in a second molding step while a second plastic housing part is being formed, in order to form an integral plastic housing. Moreover, the invention relates to a plastic housing with at least one first plastic housing part including at least one guide or bearing for at least one mechanically movable component, where the at least one plastic housing part is entirely or partially overmolded by a second plastic housing part so that the integral plastic housing is formed.

The present invention provides a gasket material containing a steel plate and a foamed rubber layer disposed on both sides or one side of the steel plate, wherein the foamed rubber layer is provided by a process including foaming a pre-foamed layer containing a pre-foamed composition, wherein the pre-foamed layer has a thickness of 15 to 50 μm, and the pre-foamed composition has a foaming factor of 2 to 4, a method for producing a gasket material, and a gasket containing the gasket material.

The present invention relates to a method for sealing rock or soil comprising inserting a sealing composition obtained by mixing a silica sol and at least one gelling agent, wherein the silica sol has an S-value higher than about 72%, a method for preparing the sealing composition and the composition obtained from the method.

The present invention provides calcium sulphate-based product having reduced shrinkage after exposure to high temperatures, the product comprising gypsum, a pozzolan source (e.g. in an amount between 4-27 wt %) and a metal salt additive (in an amount between 0.5 and 10 wt %). The pozzolan source may be selected from a kaolinitic clay material, fly ash, rice husk ash, diatomaceous earths, volcanic ashes and pumices, micro-silica, silica fume and silicone oil. The metal salt additive may be a metal salt which decomposes between a temperature of 300-500.degree. C. to yield a metal oxide, e.g. magnesium nitrate.