Metal working – Method of mechanical manufacture – Electrical device making
Patent
1978-11-02
1980-12-02
Husar, Francis S.
Metal working
Method of mechanical manufacture
Electrical device making
23232R, 264 296, 324 71SN, 324 65R, H01R 4300
Patent
active
042363071
ABSTRACT:
A method of making an element for sensing the presence of nitrogen dioxide gas in the environment. The element is formed by heating a film of an electrically non-conductive polyaromatic polymer to a temperature sufficiently high to pyrolyze the polymer and render the polymer semi-conductive. The pyrolyzed film is mounted on an electrically non-conductive base. Electrical leads are attached at spaced locations to the film and are connected in an electrical circuit with a signalling or control mechanism. The presence of nitrogen dioxide gas will cause a change in the electrical characteristics of the film to thereby activate the mechanism. A heating element can be associated with the base to insure constant temperature and humidity conditions.
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Colla Jeannine O.
Thoma Paul E.
Arbes C. J.
Husar Francis S.
Johnson Controls Inc.
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