US4251225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of detecting carbon monoxide
Assignee: Nohmi Bosai Ltd
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Filing: 1979-07-27
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Granted: 1981-02-17
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Expires: 1999-07-27
Abstract
Abstract Method of detecting carbon monoxide gas at temperatures of 100° C. or less by using a detecting element containing stannic oxide as the main component, which element is prepared by mixing stannic oxide, antimony trioxide and platinum in atomic ratios of Sb/Sn = at least 0.005, Pt/Sn = at least 0.004 and Sb/Pt = at least 0.005, and sintering said mixture at a temperature of at least 625° C.
Inventors
- 👤 Takashi Handa
- 👤 Koichi Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:22
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/204998; Y10T436/205831
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
77 words
A method of detecting carbon monoxide gas at a temperature of from -10° to 100° C., by using, as the only carbon monoxide gas detecting element, an element consisting of stannic oxide as the main component, antimony, and platinum, which element is prepared by mixing stannic oxide, antimony trioxide and platinum in atomic ratios of Sb/Sn=at least 0.005, Pt/Sn=at least 0.004 and Sb/Pt=at least 0.005, and sintering said mixture at a temperature of at least 625° C.
Claim 2
Independent Claim
77 words
A method of detecting carbon monoxide gas at a temperature of from -10° to 100° C., by using, as the only carbon monoxide gas detecting element, an element consisting of stannic oxide as the main component, antimony, and platinum, which element is prepared by mixing stannic oxide, antimony trioxide and platinum in atomic ratios of Sb/Sn=at least 0.005, Pt/Sn=at least 0.004 and Sb/Pt=at least 0.005, and sintering said mixture at a temperature of at least 625° C.
Claim 3
Dependent Claim
15 words
A method according to claim 1, wherein said atomic ratios are Sb/Sn=0.005-0.1, Pt/Sn=0.004-0.2 and Sb/Pt=0.005-5.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |