Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 6933421 | Methods of making disposable products having humidity activated materials with shape-memory The present invention relates to shape deformable materials, which are capable of (1) being deformed, (2) storing an amount of shape deformation, and (3) recovering at least a portion of the shape deformation when exposed to a humid environment. The shape deformable... | 08/23/2005 |
| 6376250 | Composition and probe for detection of water A visual indicating paste composition for detecting of aqueous solutions in hydrocarbons by changes in color. The paste is utilized by placing on a probe and inserting the probe in a storage device for fuel. Said paste comprising: a) a liquid carrier sele... | 04/23/2002 |
| 5608374 | Humidity sensor and a method of producing the humidity sensor A humidity sensor to detect humidity by utilizing a change in the electric characteristics of the device corresponding to a change in the humidity. A solution containing manganese acetate, lead acetate and potassium acetate is coated on an alumina substra... | 03/04/1997 |
| 5421192 | Leak detection in heating, ventilating and air conditioning systems using an environmentally safe material The present invention relates to the effective leak detection of refrigerants by the addition of dyes from the general chemical class of naphthalimide fluorescent dyes in a refrigeration system where said refrigeration system employs alone, or in combinat... | 06/06/1995 |
| 5357782 | Leak detection in heating, ventilating and air conditioning systems using an environmentally safe material Refrigerant leakage in heating, ventilating and air conditioning systems employing hydrofluorocarbon refrigerants is determined by adding a mixture of predetermined amounts of a naphthalamide optical brightener with an appropriate lubricant to the system.... | 10/25/1994 |
| 5348761 | Use of a swellable plastic and process for making a resistive moisture sensor A process is disclosed for producing a swellable plastic resistive moisture sensor comprising dispersing an additive selected from the group consisting of carbon in powder, dust or soot form, carbon black, graphite, a metal in powder or dust form, and mix... | 09/20/1994 |
| 5112768 | Real-time passive detection of humidity using vanillin A method and device involving use of the reaction product of an aldehyde acidified with sulfuric acid in acetone for sensing moisture. The reaction product is used as a coating for colorimetric detection of humidity, the color of the coating changing as a... | 05/12/1992 |
| 5082588 | Optical and capacitance type, phase transition, humidity-responsive devices The invention provides novel chemical compositions for use in primary, optical/capacitance hygrometric devices. It also provides methods for using these compositions as sensors for the precise measurement of the humidity of gases as well as the apparatus.... | 01/21/1992 |
| 4990284 | Moisture indicating ink and package having same A solution-type moisture indicating ink to be printed on a substrate and change color at a preselected ambient moisture. The indicator ink includes a solvent carrier system, a moisture indicating substance which changes color under the influence of moistu... | 02/05/1991 |
| 4975249 | Optical and capacitance type, phase transition, humidity-responsive devices The invention provides novel chemical compositions for use in primary, optical/capacitance hygrometric devices. It also provides methods for using these compositions as sensors for the precise measurements of the humidity of gases as well as the apparatus... | 12/04/1990 |
| 4793175 | Humidity sensor, sensor material, method of manufacture and humidity sensing system, especially for automotive use An ion conductive sensor is connected to a current source which, in order to prevent polarization effects, controls current flow through the sensor in spaced or polarity-alternating pulses. If the sensor is a humidity sensor, it is preferably constituted ... | 12/27/1988 |
| 4643122 | Diffusion controlled security tags A diffusion-controlled security tag comprising a carrier containing a solution of a compound which changes color upon diffusion or evaporation of the solvent. Preferably the carrier is enveloped in a barrier film which controls the rate of diffusion/evapo... | 02/17/1987 |
| 4550676 | Elapsed time indicator An elapsed time indicator in which an indicator, such as a flowable colorant, is releasably contained within an enclosure at least a portion of which is a volatilizable, preferably sublimable, substance.... | 11/05/1985 |
| 4391859 | Process and a composition for the insulation of surfaces, and product hereby obtained The invention relates to a process for insulating surfaces for the purpose of preventing or reducing occurrence of condensation on the surface, comprising applying to the surface a layer of a coating composition containing a binder and, distributed therei... | 07/05/1983 |
| 4373391 | Relative humidity sensitive material A relative humidity sensitive material comprises a mixture of at least one hygroscopic salt and an at least partially electrically conductive metal based powder. Each salt in the relative humidity sensitive material has a cationic constituent selected fro... | 02/15/1983 |
| 4179397 | Indicator ink An ink composition is provided which is suitable for use on plastic, bare metal, for example, tinplate or aluminum as well as on such metals having organic coatings applied to surfaces thereof. The inks are suitable for use in contact printers or in jet i... | 12/18/1979 |
| 4166891 | Visual-type hygrometer A composition of matter for use in a visual-type instrument which includes a polarizer for a light beam and an analyzer for a light beam, the chemical composition being birefringent at a first relative humidity and nonbirefringent at a second relative hum... | 09/04/1979 |
| 4041437 | Humidity sensor This invention provides a humidity sensor having a negative coefficient of resistivity for relative humidity, which comprises 99.99 to 10 mole percent of iron oxide (Fe2 O3) and 0.01 to 90 mole percent of at least one member selected... | 08/09/1977 |
| 3972826 | Fuel moisture analog This invention relates to the reproduction of all the essential moisture sorption characteristics of dead wildland fuels through use of an inorganic fuel moisture analog sensor. This inorganic fuel moisture analog sensor is calibrated to and reproduces al... | 08/03/1976 |
