US4822465A
Expired / Lapsed
US
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Hydrogen sulphide sensor
Assignee: Teledyne UK Ltd
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Filing: 1987-06-30
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Granted: 1989-04-18
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Expires: 2007-06-30
Abstract
Abstract Hydrogen Sulphide is a toxic gas present in many environments. It is necessary for a detector to be highly sensitive and not to respond to other common gases. The sensor is made up of electrodes (5) coated with a thin layer (6) of material comprising the oxides of molybdenum and tungsten and in the presence of hydrogen sulphide gas, changes its resistance. The layer is formed in such a way that a bronze-like ordered lattice is formed, containing molybdenum, tungsten and oxygen ions.
Inventors
- 👤 Eric Jones
- 👤 Alan M. Doncaster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:40
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0036; G01N33/0044
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
29 words
A hydrogen sulphide sensor including a sensing element comprising an ordered lattice containing only molybdenum, tungsten and oxygen ions; and electrical means for passing electric current through the element.
Claim 2
Dependent Claim
29 words
A hydrogen sulphide sensor including a sensing element comprising an ordered lattice containing only molybdenum, tungsten and oxygen ions; and electrical means for passing electric current through the element.
Claim 3
Dependent Claim
41 words
A hydrogen sulphide sensor as claimed in claim 1 wherein the electrical means includes a pair of electrodes deposited on an insulating substrate and the sensing element is a thin film covering the electrodes and making a conductive path between them.
Claim 4
Dependent Claim
16 words
A hydrogen sulphide sensor as claimed in claim 2 wherein the electrodes form an interdigitated array.
Claim 5
Dependent Claim
20 words
A hydrogen sulphide sensor as claimed in claim 1 including heating means to control the temperature of the sensing element.
Claim 6
Independent Claim
52 words
A method of fabricating a hydrogen sulphide sensor including the step of depositing two or more compounds, each containing at least one of molybdenum, tungsten and oxygen, over a substrate in such a manner that a thin film is formed, having an ordered lattice structure of only molybdenum, tungsten and oxygen ions.
Claim 7
Independent Claim
52 words
A method of fabricating a hydrogen sulphide sensor including the step of depositing two or more compounds, each containing at least one of molybdenum, tungsten and oxygen, over a substrate in such a manner that a thin film is formed, having an ordered lattice structure of only molybdenum, tungsten and oxygen ions.
Claim 8
Dependent Claim
22 words
A method as claimed in claim 5 wherein the compounds are deposited in such a manner that a bronze-like structure is formed.
Claim 9
Dependent Claim
45 words
A method as claimed in claim 5 wherein a first layer containing a first compound is deposited over a substrate and a second layer containing a second compound is deposited over the first layer, each compound containing at least one of molybdenum, tungsten and oxygen.
Claim 10
Dependent Claim
42 words
A method as claimed in claim 7 wherein layers of molybdenum sulphide and tungsten oxide are sputtered on to the substrate and the resulting combination is heated, in the presence of oxygen, for a chosen period of time at a chosen temperature.
Claim 11
Dependent Claim
15 words
A method as claimed in claim 8 wherein the combination is heated at 500° C.
Claim 12
Dependent Claim
15 words
A hydrogen sulphide sensor, including a sensing element fabricated by the method of claim 5.
Claim 13
Dependent Claim
15 words
A hydrogen sulphide sensor, including a sensing element fabricated by the method of claim 8.
References Cited (Backward Citations)
GB1204708A
Cited
GB1527406A
Cited
US4197089A
Cited
US4339424A
Cited
US4453151A
Cited
GB2137356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |