Title: Humidity sensitive ceramic resistor

Abstract: There is provided a humidity sensitive ceramic resistor having high humidity activity, low electrical resistance, quick response rate to humidity and high stability with respect to time, temperature, humidity and electric load which is suited for humidity-controlling devices. The ceramic resistor comprises a ceramic composition comprising at least one component having a spinel type cubic symmetry selected from the group consisting of MgCr.sub.2 O.sub.4, FeCr.sub.2 O.sub.4, NiCr.sub.2 O.sub.4, CoCr.sub.2 O.sub.4, MnCr.sub.2 O.sub.4, CuCr.sub.2 O.sub.4, Mg.sub.2 TiO.sub.4, Zn.sub.2 TiO.sub.4, Mg.sub.2 SnO.sub.4 and Zn.sub.2 SnO.sub.4, and , if desired, at least one component selected from the group consisting of TiO.sub.2, ZrO.sub.2, HfO.sub.2 and SnO.sub.2.

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Inventors: Nitta, Tsuneharu (Katano, JA)
Terada, Ziro (Yao, JA)
Hayakawa, Shigeru (Hirakata, JA)

Application Number: 720078
Filing Date: 1976-09-02
Publication_date: 1978-04-25
Assignee: Matsushita Electric Industrial Co., Ltd. (JA)
Primary Class(es): 338/35 252/518.1, 252/520.1, 252/520.2, 252/521.2, 338/34
Other Classes:
US Patent Ref:

3766098	Oct, 1973	Masuyama et al.	252/519.
3926858	Dec, 1975	Ichinose et al.	252/519.

Other Refs:
Primary Examiner: Padgett, Benjamin R.
Assistant Examiner: Barr, Josephine L.
Attorney: Wenderoth, Lind & Ponack