Humidity-sensitive element for humidity sensor

Details Humidity-sensitive element for humidity sensor Humidity-sensitive element for humidity sensor

2008-07-29

2008-07-29

Woodward, Ana L (Department: 1796)

Measuring and testing

Gas analysis

Moisture content or vapor pressure

C073S029020, C073S335020, C073S335040

Reexamination Certificate

active

07404312

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:
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patent: 6262223 (2001-07-01), Meador et al.
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patent: 2006-119153 (2006-05-01), None
patent: WO 01/69225 (2001-09-01), None

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