Method of making a nitrogen dioxide sensing element
US4236307A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1978 |
| Grant date | Dec 2, 1980 |
| Priority date | — |
| Expiry date | Nov 2, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/178459
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.