Semiconductors
US4722905A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1982 |
| Grant date | Feb 2, 1988 |
| Priority date | — |
| Expiry date | Nov 30, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/177692
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gas sensor element comprising a film of a semiconducting compound of formula I supported by a non-conductive substrate, the film being disposed between conductors for supplying a current to the film and withdrawing a current therefrom. ##STR1## in which: M represents 2H, Mn, Fe, Co, Ni, Cu, Hg, Cd, Pb, Pt or Pd; PA1 R.sub.1 represents H, CH.sub.3, Cl, Br, I, CN, CO.sub.2 H, COOC.sub.n H.sub.2n+1, CONH.sub.2 or NO.sub.2 ; PA1 R.sub.2 represents H or CH.sub.3 ; and PA1 R.sub.3.sup.a and R.sub.3.sup.b, which may be identical or different represent H, NO.sub.2, Cl, CO.sub.2 H or CH.sub.3 ; PA1 provided that when M represents cobalt at least one of R.sub.1, R.sub.2, R.sub.3.sup.a and R.sub.3.sup.b is other than hydrogen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.