Patent US3955929A successfully refreshed from Google Patents.
US3955929A
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US
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Gas detecting sensor
Assignee: Nichicon Corp
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Filing: 1974-10-18
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Granted: 1976-05-11
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Expires: 1994-10-18
Abstract
Abstract Gas detecting sensor made of SnO 2 characterized by containing less than 5% by weight of at least one of Al 2 O 3 , ZnO, SrO and BaO and less than 1% by weight of chlorine. The gas detecting sensor has a high sensitivity selectively to carbon monoxide but has a low sensitivity to hydrocarbon gases.
Inventors
- 👤 Takaya Kawakami
- 👤 Toshinori Kitamura
- 👤 Nobuyuki Yamaji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:59
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; Y; Y10; Y10S; Y10S252/00; Y10S252/964; Y10T; Y10T436/00; Y10T436/20; Y10T436/204998; Y10T436/205831; Y10T436/21; Y10T436/214; Y10T436/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
55 words
A gas detecting means comprising SnO 2 containing from more than 0% by weight to less than 5% by weight of at least one material selected from the group consisting of Al 2 O 3 , ZnO, SrO and BaO and from more than 0% by weight to less than 1% by weight of chlorine.
Claim 2
Dependent Claim
55 words
A gas detecting means comprising SnO 2 containing from more than 0% by weight to less than 5% by weight of at least one material selected from the group consisting of Al 2 O 3 , ZnO, SrO and BaO and from more than 0% by weight to less than 1% by weight of chlorine.
Claim 3
Dependent Claim
22 words
The gas detecting sensor of claim 1 containing 0.5% by weight of Al 2 O 3 and 0.1% by weight of chlorine.
Claim 4
Dependent Claim
19 words
The gas detecting sensor of claim 1 containing 0.2% by weight of ZnO and 0.2% by weight of chlorine.
Claim 5
Dependent Claim
19 words
The gas detecting sensor of claim 1 containing 3% by weight of SrO and 0.8% by weight of chlorine.
Claim 6
Dependent Claim
19 words
The gas detecting sensor of claim 1 containing 2% by weight of BaO and 0.4% by weight of chlorine.
Claim 7
Dependent Claim
45 words
A gas detecting sensor comprising SnO 2 containing about 0.2 to 5% by weight of at least one material selected from the group consisting of Al 2 O 3 , ZnO, SrO and BaO and about 0.1 to less than 1% by weight of chlorine.
Claim 8
Dependent Claim
45 words
A gas detecting sensor comprising SnO 2 containing about 0.2 to 5% by weight of at least one material selected from the group consisting of Al 2 O 3 , ZnO, SrO and BaO and about 0.1 to less than 1% by weight of chlorine.
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) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |