Process for the production of a capacitive hygrometer
Patent 4482581 Issued on November 13, 1984. Estimated Expiration Date: 
January 19, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 19, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAbsolute humidity sensors and methods of manufacturing humidity sensors Patent #: 4203087 InventorsAssigneeApplicationNo. 06/340732 filed on 01/19/1982US Classes:427/79, Condenser or capacitor338/35, Humidity361/286, Humidity427/383.1, Metal coating427/383.3, Inorganic base427/383.5Fused oxide-containing base (e.g., ceramic, glass, etc.)ExaminersPrimary: Kittle, John E.Assistant: Seidleck, James J. Attorney, Agent or FirmInternational ClassG01N 27/22 (20060101)Foreign Application Priority Data1981-01-19 FRAbstractThe present invention relates to a process for producing a capacitive hygrometer, as well as to a hygrometer obtained by this process.Onto a conductive layer forming the first electrode is deposited a layer of a material with a dielectric constant varying as a function of the quantity of water absorbed. Onto the said dielectric material layer is then deposited a layer with a thickness exceeding 200 Å of a slightly oxidizable metal, which forms the second electrode. The latter is made permeable to water by heat treatment at a temperature close to the softening temperature of the dielectric.Application to the measurement of the relative humidity of air. | |
