Title: Humidity-sensitive sensor

Abstract: A humidity-sensitive sensor, especially useful on the window of an automobile with the sensor on the inside surface of the glass. The sensor has a pair of spaced electrodes and a humidity-sensitive coating composed of a hydroscopic resin extending over the pair of electrodes. The resin can be an acrylate resin or a methacrylate resin, and preferably is a resin which has a volume change of at least 10% in response to a 50% change in humidity. Dispersed in the resin are electrically conductive particles, preferably in an amount of from 20 to 60% by volume of the amount of resin. The sensor, prior to its use in an operating device, is preferably exposed to a high humidity condition and a low humidity condition at least thirty times in order to stabilize it.

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Inventors: Ohsato, Nobuyoshi (Itami, JA)
Sono, Kenzo (Nishinomiya, JA)
Tanaka, Keihachiro (Itami, JA)

Application Number: 496856
Filing Date: 1974-08-12
Publication_date: 1976-09-28
Assignee: Nippon Sheet Glass Co., Ltd. (Osaka, JA)
Primary Class(es): 338/35 73/335.05, 200/61.04, 219/203, 219/522, 428/328, 428/329
Other Classes:
US Patent Ref:

2937524	May, 1960	Gregor	338/35.
3671913	Jun, 1972	Mamiya et al.	338/35.
3686606	Aug, 1972	Thoma	338/35.
3848218	Nov, 1974	Wakabayashi	338/35.
3868492	Feb, 1975	Taylor	338/35.

Other Refs:
Primary Examiner: Albritton, C. L.
Assistant Examiner:
Attorney: Wenderoth, Lind & Ponack