US4067695A
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Gas sensing element
Assignee: Nittan Co Ltd
•
Filing: 1977-01-19
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Granted: 1978-01-10
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Expires: 1997-01-19
Abstract
Abstract A gas sensing element which varies its resistivity upon the adsorption of gas and which has a sintered body including an oxyacid salt semiconductor and which may also contain carbon.
Inventors
- 👤 Yoichiro Miyaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:00
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
41 words
A gas sensing element comprising a semiconductor body having a pair of electrodes and changing its electric resistivity with ambient gas concentration, wherein said semiconductor body consists of a sintered body of a composition containing an oxyacid salt compound semiconductor material.
Claim 2
Dependent Claim
41 words
A gas sensing element comprising a semiconductor body having a pair of electrodes and changing its electric resistivity with ambient gas concentration, wherein said semiconductor body consists of a sintered body of a composition containing an oxyacid salt compound semiconductor material.
Claim 3
Dependent Claim
26 words
A gas sensing element, according to claim 1 wherein said oxyacid salt is one selected from the group consisting of silicates, chromates, molybdates, tungstates and phosphates.
Claim 4
Dependent Claim
30 words
A gas sensing element according to claim 1 wherein said oxyacid salt compound semiconductor contains at least one element selected from the group consisting of Sn, Nb, La, and In.
Claim 5
Dependent Claim
35 words
A gas sensing element according to claim 1 wherein said composition contains at least one element selected from the group consisting of Pt, Pd, Rh, Ru, Au, Ag, Zr, In, Ni, Co, Cr, and Mn.
Claim 6
Dependent Claim
13 words
A gas sensing element according to claim 1 wherein said composition contains carbon.
Claim 7
Dependent Claim
18 words
A gas sensing element according to claim 1 wherein said semiconductor body is provided with a heating element.
Claim 8
Dependent Claim
18 words
A gas sensing element according to claim 1 wherein said heating element is a positive temperature coefficient resistor.
References Cited (Backward Citations)
US3255324A
Cited
US3900815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |