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| Number | Title | Issue Date |
| 4149413 | Optically active liquid crystal mixtures and liquid crystal devices containing them The present invention discloses chiral thermochromic liquid crystal mixtures which do not contain cholesterol or sterol residues.... | 04/17/1979 |
| 4149852 | Thermochromic composition, method of making, and use PH indicator composition has controlled change of color at a selected sub-freezing temperature. The composition comprises at least one pH indicator, a buffer solution containing at least one inorganic ion in solution and a control agent or a precursor of ... | 04/17/1979 |
| 4148951 | Image retention on topical thermograph Heat storage means are provided for reducing heat loss from a liquid crystal thermographic sheet, which normally has good heat transmission characteristics in order to respond readily to temperature variations along a body surface against which the sheet ... | 04/10/1979 |
| 4145186 | Sterilization detection device and method In measuring the dose of sterilant delivered to an enclosed space, a mixture of a salt of a strong acid and a weak base and an acid-alkali indicator dye is disposed within a container element impermeable to the sterilant. The container has an opening, and... | 03/20/1979 |
| 4140016 | Novel compositions, devices and method Disclosure is made of novel temperature sensing devices such as temperature indicating and recording devices. The devices of the invention differ from prior art devices in that they employ new and improved temperature indicating compositions. The temperat... | 02/20/1979 |
| 4138357 | Thermochromic material A thermochromic material, and a heat sensitive recording material containing the same, comprising a substantially colorless electron donating color former capable of forming a color upon reacting with an electron accepting acid compound and a compound rep... | 02/06/1979 |
| 4137769 | Method and apparatus for determining internal temperature of an object A material visually changeable with changing temperature is incorporated internally in a transparent solid body having physical dimensions and thermal conductivity and diffusivity characteristics selected to provide a thermal analog of an object. The obje... | 02/06/1979 |
| 4135497 | Apparatus for detecting temperature variations over selected regions of living tissue, and method thereof An apparatus for detecting temperature variations over selected regions of living tissue. The invention relates to the apparatus and to the method of detecting said temperature variations for aid in the early detection of malignant tissue in the breasts. ... | 01/23/1979 |
| 4132464 | Liquid crystal device Provided is a liquid crystal device comprising a lyotropic-type cholesteric liquid crystal and an enclosure surrounding the liquid crystal, at least a part of which enclosure is transparent, so that the color of the liquid crystal, varying depending upon ... | 01/02/1979 |
| 4115068 | Air detecting device for steam or gas sterilizers Air indicating device for use in steam or gas sterilizers and the like includes an upright tube placed in the sterilizer. The tube is open at its bottom to the sterilizing chamber and is closed at its top. A heat sink within the tube causes steam entering... | 09/19/1978 |
| 4101696 | Thermographic plate for measuring temperature distributions The thermographic plate consists of a carrier film, a latex-based optically inhomogeneous black layer applied thereto and of a layer containing liquid crystals. The thickness of the black layer amounts to between 4 and 18 μm. By virtue of this coordinati... | 07/18/1978 |
| 4087575 | Liquid crystal film Liquid crystal preparations, for examination of objects by visualizing temperature differences, are made in the form of highly stretchable elastomeric films by dispersing cholesteric liquid crystal esters in a solution of a thermoplastic elastomer such as... | 05/02/1978 |
| 4070912 | Temperature indicating compositions and devices Polymeric mixtures of a cholesterol material and a monomer are disclosed which can advantageously be utilized for the construction of temperature indicating devices. Each polymeric composition exhibits a color at temperatures below a fixed threshold tempe... | 01/31/1978 |
| 4066567 | Liquid crystal cumulative dosimeter Cumulative temperature dosimeter utilizes a temperature dependent reaction in a cholesteric liquid crystal composition to produce a color change indicative of temperature exposure over a period of time. Typically, the composition includes, as a solvent, a chol... | 01/03/1978 |
| 4064872 | Temperature measuring device of a liquid crystal laminate Device for measuring temperature differentials on mammalian skin surfaces comprising separate dots of liquid crystals, sealed in a grid pattern between thin, performed, flexible films.... | 12/27/1977 |
| 4060654 | Lamellar pellicle for thermography The disclosure is of a composite lamellar pellicle for producing thermographic patterns by means of liquid crystals which are spread upon an inner sheet and sandwiched between two outer sheets both of which have adequate mechanical strength for normal han... | 11/29/1977 |
| 4022706 | Cholesteric liquid crystal water base ink and laminates formed therefrom Thin stable, substantially uniform, liquid crystal containing films are provided by coating a liquid crystal containing ink onto an inert substrate, which may be transparent, or opaque, optionally pigmented, particularly black pigment. The liquid crystal ... | 05/10/1977 |
| 4019368 | Pictorial room thermometer A device for indicating ambient or room temperature in which the representation of the ambient or room temperature is in terms of specific colors and or shapes incorporated in a picture, instead of the usual digital or numeric way. It consists of a painti... | 04/26/1977 |
| 4016019 | Integrated indicator system for solvent removal Volatile, organic solvent is removed from textile articles that are provided with thermosensitive fibers capable of visually indicating predetermined maximum temperatures. Textile articles, such as tufted carpet, are heated under conditions effective to e... | 04/05/1977 |
| 4015591 | Cholesteric liquid crystalline phase material-dye composition and venapuncture method employing the composition A composition of matter having thermal color responsive characteristics and adapted for exhibiting improved color contrast includes an enantiotropic cholesteric liquid crystalline phase material, and at least two oil-soluble dyes dissolved in the material... | 04/05/1977 |
| 3998210 | Method of locating vein A laminate includes a backing of generally flexible, transparent sheet material supporting a particular layer of encapsulated liquid crystal material having properties for providing color variations in response to slight variations in temperature. A mixtu... | 12/21/1976 |
| 3996802 | Device for testing sterilization apparatus A device for testing the level, uniformity and duration of the temperature in a sterilization apparatus, such as a steam sterilizer or the like. The device comprises a unitary support means adapted to be positioned in the sterilization apparatus. First te... | 12/14/1976 |
| 3993809 | Method of measuring a two-dimensional temperature distribution For measuring a two-dimensional temperature distribution a thermographic film is used which consists of a layer containing temperature-sensitive liquid crystals and an antireflection layer. The film is arranged an auxiliary support which is removed from t... | 11/23/1976 |
| 3980581 | Temperature indicating compositions Thermally responsive materials are provided having improved resolidification (recrystallization) characteristics. These thermally responsive materials are useful as temperature indicating compositions by undergoing change of state as precise and predeterm... | 09/14/1976 |
| 3975288 | High temperature non-crystallizing cholesteric liquid crystal compositions High temperature non-crystallizing cholesteric liquid crystal compositions are provided having at least about 50 weight percent of cholesteryl 3-chloropropionate, at least about 30 weight percent of a cholesteryl ester, wherein the acyl group has a substi... | 08/17/1976 |
| 3974317 | Thermometric compositions including inert additives and products Thermometric compositions for recording changes in temperature comprising a cholesteric liquid crystal system together with a chemically inert substance which is miscible with the crystal system. By varying the amount of the second component in the compos... | 08/10/1976 |
| 3974180 | Furanes, their manufacture and use The invention relates to specific naphthofuranes which are useful as cryochromic substances e.g. for measuring the temperature, pH value or radiation field.... | 08/10/1976 |
| 3969264 | Cholesteric liquid crystal water base ink Thin stable, substantially uniform, liquid crystal containing films are provided by coating onto an inert, normally darkened substrate, an ink comprising an oil in water latex, a small amount of an organic solvent, usually a polar moderately water soluble... | 07/13/1976 |
| 3961530 | Method and thermometer for measuring temperature by determination of saturation of a solvent having temperature dependent characteristics The thermometer of the invention is characterized by a substance, preferably a salt, the solubility of which changes with temperature and which is present in a solid or liquid phase in the temperature range in which the thermometer is intended to be used,... | 06/08/1976 |
| 3956153 | Regenerative nucleating agents The phenomena of undercooling encountered with various heat responsive materials in passing from the liquid to solid phase is minimized by incorporation of a regenerative nucleating agent which is soluble to some degree in the heat responsive materials.... | 05/11/1976 |
| 3955420 | Compact tubular temperature measuring device A rapid and convenient temperature indicator is provided having a tubular heat-conducting member joined at one end to a heat sink and having the other end rounded for ease of contact with the surface whose temperature is to be measured. Conveniently, a cy... | 05/11/1976 |
| 3951133 | Device to display skin temperature changes by changes in color Two or more sheets of liquid crystal thermal film assembled side by side, one surface of which assembly is covered by a flat piece of temperature equalizing material made of high thermal conductivity material, such as tin-foil, which film sheets change co... | 04/20/1976 |
