Capacitive sensors for measuring humidity and method of making same
Patent 6450026 Issued on September 17, 2002. Estimated Expiration Date: 
December 18, 2020. 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.
December 18, 2020. 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 ReferencesHumidity sensing element of electric capacitance change type and method of producing same Capacitance humidity sensing element Process for the production of a capacitive hygrometer Capacitance humidity sensor Solid electrolytic capacitors comprising a conductive layer made of a polymer of pyrrole or its derivative Patent #: 5812367 InventorApplicationNo. 582768 filed on 12/18/2000US Classes:73/335.04, Capacitance324/361, With mechanical current reversing means324/427, To determine ampere-hour charge capacity324/663, Where a material or object forms part of the dielectric being measured324/664, To determine water content324/689To determine water contentExaminersPrimary: Larkin, Daniel S.Attorney, Agent or FirmForeign Patent References
International ClassesG01N 027/22G01D 005/24 H01G 004/00 H01G 004/256 AbstractThe invention concerns a sensor comprising two electrodes (1, 3a) separated by a dielectric material (2). One electrode (3a) being produced by using a non-porous metal sheet, the other electrode (1) being advantageously made of a non-metallic porous material made conductive and the dielectric material being advantageously in the form of a multilayer polymer film (2). The resulting sensor can be adjusted to the desired value by a particular capacitor by reducing the useful surface of the porous electrode (1). The reduction step carried out by simply scraping or eroding the material constituting the porous electrode (1). | |
