US4913792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flammable-gas sensor
Assignee: Daikin Industries Ltd
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Filing: 1987-07-28
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Granted: 1990-04-03
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Expires: 2007-07-28
Abstract
Abstract At the surface of an insulating substrate there are provided a working electrode and an counter electrode with a set space from the working electrode and a gas-permeable, proton-conductive film with which the surfaces of the electrodes are overlaid in such a manner as to form an integrated whole with the electrodes. By applying a set voltage between the two electrodes, flammable gas which has permeated the gas-permeable, proton conductive film is made to undergo oxidation and reduction at a surface of the working electrode, and protons which have been produced thereby move toward the counter electrode in the gas-permeable, proton-conductive film, so that the concentration of the flammable gas can be measured. A reference electrode can be provided for the purpose of stabilizing potential of the working electrode. A mechanism which is described above can be applied to a gas sensor of field-effect transistor type.
Inventors
- 👤 Yasuhiro Nagata
- 👤 Satoru Sato
- 👤 Kiyoshi Furuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:30
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/414; G01N27/4141; G01N27/416; G01N27/404; G01N27/4045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
A flammable-gas sensor comprising: an insulating substrate, a working electrode provided at the surface of said insulating substrate, a counter electrode provided at a surface of said insulating substrate and positioned with a set gap from said working electrode, and a gas permeable, proton-conductive film which covers said working electrode and counter electrode and forms an integrated whole with said working electrode and counter electrode, wherein said counter electrode is larger in area than said working electrode by a factor of 10 or more.
Claim 2
Dependent Claim
84 words
A flammable-gas sensor comprising: an insulating substrate, a working electrode provided at the surface of said insulating substrate, a counter electrode provided at a surface of said insulating substrate and positioned with a set gap from said working electrode, and a gas permeable, proton-conductive film which covers said working electrode and counter electrode and forms an integrated whole with said working electrode and counter electrode, wherein said counter electrode is larger in area than said working electrode by a factor of 10 or more.
Claim 3
Dependent Claim
109 words
A flammable-gas sensor comprising: an insulating substrate, a working electrode provided at a surface of said insulating substrate, a counter electrode provided at the surface of said insulating substrate and positioned with a set gap from said working electrode, a reference electrode provided at the surface of said insulating substrate and positioned with set gaps from said working electrode and counter electrode, and a gas permeable, proton-conductive film which covers said working electrode, counter electrode and reference electrode and forms an integrated whole with said working electrode, counter electrode and reference electrode, wherein said reference electrode and counter electrode form coaxial circles with said working electrode at the center.
Claim 4
Dependent Claim
109 words
A flammable-gas sensor comprising: an insulating substrate, a working electrode provided at a surface of said insulating substrate, a counter electrode provided at the surface of said insulating substrate and positioned with a set gap from said working electrode, a reference electrode provided at the surface of said insulating substrate and positioned with set gaps from said working electrode and counter electrode, and a gas permeable, proton-conductive film which covers said working electrode, counter electrode and reference electrode and forms an integrated whole with said working electrode, counter electrode and reference electrode, wherein said reference electrode and counter electrode form coaxial circles with said working electrode at the center.
Claim 5
Dependent Claim
105 words
A flammable-gas sensor comprising: an insulating substrate, a working electrode provided at a surface of said insulating substrate, a counter electrode provided at the surface of said insulating substrate and positioned with a set gap from said working electrode, a reference electrode provided at the surface of said insulating substrate and positioned with set gaps from said working electrode and counter electrode, and a gas permeable, proton-conductive film which covers said working electrode, counter electrode and reference electrode and forms an integrated whole with said working electrode, counter electrode and reference electrode, wherein said reference electrode is positioned between said working electrode and counter electrode.
Claim 6
Dependent Claim
105 words
A flammable-gas sensor comprising: an insulating substrate, a working electrode provided at a surface of said insulating substrate, a counter electrode provided at the surface of said insulating substrate and positioned with a set gap from said working electrode, a reference electrode provided at the surface of said insulating substrate and positioned with set gaps from said working electrode and counter electrode, and a gas permeable, proton-conductive film which covers said working electrode, counter electrode and reference electrode and forms an integrated whole with said working electrode, counter electrode and reference electrode, wherein said reference electrode is positioned between said working electrode and counter electrode.
References Cited (Backward Citations)
JPS51139289A
Cited
US4076596A
Cited
JPS53115293A
Cited
JPS5564760A
Cited
JPS60211352A
Cited
US4718991A
Cited
US4795543A
Cited
US4820386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |