Nitrogen dioxide sensing element and method of sensing the presence of nitrogen dioxide
US4142400A · kind A · utility
17Cited by
4References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1977 |
| Grant date | Mar 6, 1979 |
| Priority date | — |
| Expiry date | Mar 7, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C17/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An element for sensing the presence of nitrogen dioxide gas in the environment. The element comprises a film of a pyrolyzed polyaromatic polymer having semi-conductive properties which 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.