Capacitance humidity sensor
Patent 5177662 Issued on January 5, 1993. Estimated Expiration Date: 
February 5, 2012. 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.
February 5, 2012. 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 References 3458845 3582728 3697450 3802268 Humidity sensing element Capacitance humidity sensor Capacitive humidity sensor Moisture-sensitive element for moisture sensors Patent #: 5069069 InventorAssigneeApplicationNo. 831553 filed on 02/05/1992US Classes:361/286, Humidity29/25.42, Solid dielectric type73/335.04CapacitanceExaminersPrimary: Griffin, Ronald W.Attorney, Agent or FirmInternational ClassesH01G 005/20H01G 007/00 G01W 001/00 AbstractA capacitance humidity sensor according to the invention has a film core which is in contact with a pair of polymeric conductive layers bonded to opposite faces of the core. The core is made of a polymeric material having a dielectric constant which varies substantially linearly with humidity, such as a polyimide or polyparabanic acid. The conductive layers are made of a polymeric material, at least a portion of which includes sulfur atoms in the backbone chain and having conductive particles, such as carbon particles, dispersed therein. Such conductive layers provide superior performance and corrosion resistance in comparison to the metal films employed in the prior art and in comparison to cellulosic polymers containing conductive particles.Other References
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