US4569826A
Expired / Lapsed
US
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Gas detecting element
Assignee: Toshiba Corp
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Filing: 1984-06-27
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Granted: 1986-02-11
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Expires: 2004-06-27
Abstract
Abstract A gas detecting element comprises a substrate, a gas sensitive body provided on the substrate, a pair of electrodes connected to the gas sensitive body and a catalyst layer provided on the surface of the gas sensitive body. The catalyst layer including a carrier material and a catalyst material of copper and tungsten. The gas detecting element in accordance with the present invention has equal sensitivity to a number of different gases.
Inventors
- 👤 Masayuki Shiratori
- 👤 Tadashi Sakai
- 👤 Masaki Katsura
- 👤 Osamu Takikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:52
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
101 words
A gas detecting element comprising: a substrate; a gas sensitive body of a semiconductor oxide provided on the substrate, the resistance value of the gas sensitive body being changed when said body comes into contact with a gas to be detected; a pair of electrodes connected to said gas sensitive body; and a catalyst layer provided on a surface of said gas sensitive body, said catalyst layer including a carrier material and catalyst material of copper and tungsten, the atomic ratio of said tungsten to said copper in said catalyst layer being not less than 0.1 and not greater than 10.0.
Claim 2
Dependent Claim
101 words
A gas detecting element comprising: a substrate; a gas sensitive body of a semiconductor oxide provided on the substrate, the resistance value of the gas sensitive body being changed when said body comes into contact with a gas to be detected; a pair of electrodes connected to said gas sensitive body; and a catalyst layer provided on a surface of said gas sensitive body, said catalyst layer including a carrier material and catalyst material of copper and tungsten, the atomic ratio of said tungsten to said copper in said catalyst layer being not less than 0.1 and not greater than 10.0.
Claim 3
Dependent Claim
18 words
A gas detecting element according to claim 1 wherein said carrier material in said catalyst is aluminum oxide.
Claim 4
Dependent Claim
35 words
A gas detecting element according to claim 1 wherein the total amount of said copper and said tungsten ranges from about 0.1 to about 30 wt% as compared with the amount of said carrier material.
Claim 5
Dependent Claim
26 words
A gas detecting element according to claim 1 wherein said gas sensitive body is a semiconductor oxide film formed by thermal decomposition of an organic metal.
Claim 6
Dependent Claim
20 words
A gas detecting element according to claim 1 wherein said gas sensitive body consists of a SnO 2 type semiconductor.
Claim 7
Dependent Claim
79 words
A gas detecting element comprising: a substrate; a gas sensitive body of a semiconductor oxide provided on the substrate, the resistance value of the gas sensitive body being changed when said body comes into contact with a gas to be detected; a pair of electrodes connected to said gas sensitive body; and a catalyst layer provided on a surface of said gas sensitive body, said catalyst layer including a carrier material and catalyst material of copper sulfate and tungsten.
Claim 8
Dependent Claim
79 words
A gas detecting element comprising: a substrate; a gas sensitive body of a semiconductor oxide provided on the substrate, the resistance value of the gas sensitive body being changed when said body comes into contact with a gas to be detected; a pair of electrodes connected to said gas sensitive body; and a catalyst layer provided on a surface of said gas sensitive body, said catalyst layer including a carrier material and catalyst material of copper sulfate and tungsten.
Claim 9
Dependent Claim
81 words
A gas detecting element comprising: a substrate, a gas sensitive body of a semiconductor oxide provided on said substrate, the resistance value of said gas sensitive body being changed when said body comes in contact with a gas to be detected, a pair of electrodes connected to said gas sensitive body, and a catalyst layer provided on a surface of said gas sensitive body, said catalyst layer including a carrier material and a catalyst material of copper sulfate (CuSO 4 ).
Claim 10
Dependent Claim
81 words
A gas detecting element comprising: a substrate, a gas sensitive body of a semiconductor oxide provided on said substrate, the resistance value of said gas sensitive body being changed when said body comes in contact with a gas to be detected, a pair of electrodes connected to said gas sensitive body, and a catalyst layer provided on a surface of said gas sensitive body, said catalyst layer including a carrier material and a catalyst material of copper sulfate (CuSO 4 ).
Claim 11
Dependent Claim
18 words
A gas detecting element according to claim 7 wherein said carrier material in said catalyst is aluminum oxide.
Claim 12
Dependent Claim
31 words
A gas detecting element according to claim 7 wherein the amount of said copper sulfate ranges from about 0.1 to about 30 wt% compared with the amount of said carrier material.
Claim 13
Dependent Claim
86 words
A gas detecting element comprising: a substrate; a gas sensitive body which essentially consists of an SnO 2 type semiconductor provided on said substrate, the resistance value of said gas sensitive body being changed when said body somes into contact with a gas to be detected; a pair of electrodes connected to said gas sensitive body; and a catalyst layer provided on a surface of said gas sensitive body, said catalyst layer including a carrier material and a catalyst material of copper sulfate (CuSO 4 ).
Claim 14
Dependent Claim
86 words
A gas detecting element comprising: a substrate; a gas sensitive body which essentially consists of an SnO 2 type semiconductor provided on said substrate, the resistance value of said gas sensitive body being changed when said body somes into contact with a gas to be detected; a pair of electrodes connected to said gas sensitive body; and a catalyst layer provided on a surface of said gas sensitive body, said catalyst layer including a carrier material and a catalyst material of copper sulfate (CuSO 4 ).
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) | 1989-02-10 | 1989-08-12 | 1990-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-10 | 1993-08-12 | 1994-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-10 | 1997-08-12 | 1998-02-11 | $7700.00 | Window Closed / Lapsed |