Patent US4592967A successfully refreshed from Google Patents.
US4592967A
Expired / Lapsed
US
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Gas sensor of mixed oxides
Assignee: New Cosmos Electric Co Ltd
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Filing: 1984-02-24
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Granted: 1986-06-03
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Expires: 2004-02-24
Abstract
Abstract A gas sensor comprising a sintered piece composed of tin oxide, at least one of lanthanide oxides and at least one of IVa group element oxides. The sintered piece may be covered or coated with a porous layer of a ceramic material such as silica, alumina or silica-alumina.
Inventors
- 👤 Koji Komatsu
- 👤 Sai Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:08
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/125
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
A gas sensor adapted to detect hydrogen, methane, ethyl alcohol and the like and maintained at about 300° to 450° C. in operation, the gas sensor comprising: a sintered piece composed of tin oxide (SnO 2 ), at least one of lanthanide oxides in 0.01-20 mol % of the tin oxide, and at least one of IVa group metal oxides in 0.01-20 mol % of the tin oxide.
Claim 2
Dependent Claim
68 words
A gas sensor adapted to detect hydrogen, methane, ethyl alcohol and the like and maintained at about 300° to 450° C. in operation, the gas sensor comprising: a sintered piece composed of tin oxide (SnO 2 ), at least one of lanthanide oxides in 0.01-20 mol % of the tin oxide, and at least one of IVa group metal oxides in 0.01-20 mol % of the tin oxide.
Claim 3
Dependent Claim
44 words
A gas sensor as defined in claim 1 wherein the lanthanide oxides are contained at about 0.05 to 4 mol % of the tin oxide, and the IVa group metal oxides are contained at about 0.05 to 10 mol % of the tin oxide.
Claim 4
Dependent Claim
29 words
A gas sensor as defined in claim 2 wherein the sintered piece comprises a calcinated paste, said paste including a mixture of fine powders of all of said oxides.
Claim 5
Dependent Claim
43 words
A gas sensor as defined in claim 2 wherein the sintered piece comprises a presintered piece of tin oxide powder, the presintered piece including the lanthanide oxides and the IVa group metal oxides which are respectively converted from thermally decomposable compounds corresponding thereto.
Claim 6
Dependent Claim
26 words
A gas sensor as defined in claim 2 wherein the sintered piece comprises a calcinated coprecipitation of hydroxides of tin, lanthanides and IVa group metal oxides.
References Cited (Backward Citations)
US4397888A
Cited
US4507643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-02 | 1989-12-02 | 1990-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-02 | 1993-12-02 | 1994-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-02 | 1997-12-02 | 1998-06-03 | $7700.00 | Window Closed / Lapsed |