Humidity-sensitive element for humidity sensor

Measuring and testing – Gas analysis – Moisture content or vapor pressure

Reexamination Certificate

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Details

C073S029020, C073S335020, C073S335040

Reexamination Certificate

active

10864361

ABSTRACT:
The invention provides a humidity-sensitive element using, as a humidity-sensitive film, a polyimide having a molecular structure capable of forming a network structure at a high density, exhibiting less drift after being left standing at a high temperature and a high humidity and having excellent characteristics. A humidity-sensitive element according to the invention uses the polyimide obtained by dehydrating and ring closing a polyamide acid forming a network structure in which terminals of basic molecular chains are interconnected with one another, as a humidity-sensitive film. The humidity-sensitive element of the invention suitably uses a polyimide, in which terminals of basic molecular chains are interconnected with one another by use of triamine or a tricarboxylic acid, as a humidity sensitive film.

REFERENCES:
patent: 5011905 (1991-04-01), Lubowitz et al.
patent: 5161085 (1992-11-01), Sakai et al.
patent: 6262223 (2001-07-01), Meador et al.
patent: B-2827199 (1988-09-01), None
patent: B-2529136 (1996-06-01), None
patent: A-H11-56654 (1999-06-01), None
patent: 2002-005867 (2002-01-01), None
patent: A-2002-005867 (2002-01-01), None
patent: 2003-232765 (2003-08-01), None
patent: 2006-119153 (2006-05-01), None
patent: WO 01/69225 (2001-09-01), None

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