US4535315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkane gas sensor comprising tin oxide semiconductor with large surface area
Assignee: New Cosmos Electric Co Ltd
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Filing: 1983-12-22
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Granted: 1985-08-13
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Expires: 2003-12-22
Abstract
Abstract A gas sensor comprising a layer of sintered tin oxide having a large specific surface area and high activity to oxidize and eliminate alcohol, benzene and other miscellaneous gases, whereby the sensor selectively detects alkane gases such as methane gas, propane gas and butane gas. The alkane gas is absorbed thereby decreasing an electrical resistance of the sensor in order to detect the existence of the gas.
Inventors
- 👤 Sai Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:07
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/125
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
51 words
An alkane gas sensor comprising a semiconductor composed of sintered tin oxide and adapted to absorb an alkane gas thereby decreasing an electric resistance of the sensor so as to detect existence of said gas, wherein a specific surface area of the semiconductor is at least thirty square meters per gram.
Claim 2
Dependent Claim
51 words
An alkane gas sensor comprising a semiconductor composed of sintered tin oxide and adapted to absorb an alkane gas thereby decreasing an electric resistance of the sensor so as to detect existence of said gas, wherein a specific surface area of the semiconductor is at least thirty square meters per gram.
Claim 3
Dependent Claim
24 words
A gas sensor as defined in claim 1 wherein the specific surface area of the semiconductor is 50 to 300 square meters per gram.
Claim 4
Dependent Claim
30 words
A gas sensor as defined in claim 2 wherein at least an outer portion of the semiconductor has a specific surface area of 50 to 300 square meters per gram.
References Cited (Backward Citations)
JPS5379600A
Cited
US4313338A
Cited
JPS55158547A
Cited
JPS55167174A
Cited
JPS568538A
Cited
US4359709A
Cited
US4459577A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |