US4030340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen gas detector
Assignee: General Monitors Inc
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Filing: 1976-07-22
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Granted: 1977-06-21
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Expires: 1996-07-22
Abstract
Abstract A semiconductor article suitable for use in the detection of hydrogen gas in the atmosphere. The article comprises a film of palladium deposited onto a semiconductor film of stannic oxide which is positioned on a suitable substrate together with a resistance heating element. In some cases, the stannic oxide film is provided with a dopant to improve the operation of the article.
Inventors
- 👤 Shih-Chia Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:19
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
42 words
An article for detecting the concentration of hydrogen in the atmosphere, comprising: a semiconductor detecting film comprising stannic oxide and deposited onto an inert substrate; electrode means connected to said film; and a hydrogen activation film deposited onto said semiconductor detecting film.
Claim 2
Dependent Claim
42 words
An article for detecting the concentration of hydrogen in the atmosphere, comprising: a semiconductor detecting film comprising stannic oxide and deposited onto an inert substrate; electrode means connected to said film; and a hydrogen activation film deposited onto said semiconductor detecting film.
Claim 3
Dependent Claim
20 words
An article according to claim 1 wherein said article is further provided with a resistance heater disposed onto said substrate.
Claim 4
Dependent Claim
30 words
An article according to claim 2 wherein said substrate is also provided with a temperature sensing means for controlling said resistance heater to maintain said substrate at a constant temperature.
Claim 5
Dependent Claim
13 words
The article according to claim 3 wherein said sensing means is a thermistor.
Claim 6
Dependent Claim
31 words
An article according to claim 1 wherein said oxide is provided with a dopant selected from the group consisting of zinc, cadmium, aluminum, gallium, indium, tellurium, arsenic, antimony, bismuth or palladium.
Claim 7
Dependent Claim
11 words
An article according to claim 5 wherein said dopant is indium.
Claim 8
Dependent Claim
11 words
An article according to claim 5 wherein said dopant is aluminum.
Claim 9
Dependent Claim
25 words
An article according to claim 1 wherein said activation film is comprised of a material selected from the group consisting of palladium and palladium-gold alloy.
Claim 10
Dependent Claim
14 words
An article according to claim 1 wherein said activation film is comprised of palladium.
Claim 11
Dependent Claim
17 words
An article according to claim 9 wherein said palladium film has a thickness of between approximately 30-70A.
Claim 12
Dependent Claim
16 words
An article according to claim 10 wherein the thickness of said palladium film is approximately 50A.
Claim 13
Dependent Claim
91 words
An article for detecting the concentration of hydrogen in the atmosphere comprising: a resistance heater disposed onto an inert, refractory chip; a semiconductor detecting film deposited onto said chip and comprised of stannic oxide and a dopant selected from the group consisting of zinc, cadmium, aluminum, gallium, indium, tellurium, arsenic, antimony, bismuth or palladium, said detecting film having a separate electrical circuit from said resistance heater; and an activation film deposited onto said semiconductor detecting film and comprised of a material selected from the group consisting of palladium and palladium-gold alloy.
Claim 14
Dependent Claim
91 words
An article for detecting the concentration of hydrogen in the atmosphere comprising: a resistance heater disposed onto an inert, refractory chip; a semiconductor detecting film deposited onto said chip and comprised of stannic oxide and a dopant selected from the group consisting of zinc, cadmium, aluminum, gallium, indium, tellurium, arsenic, antimony, bismuth or palladium, said detecting film having a separate electrical circuit from said resistance heater; and an activation film deposited onto said semiconductor detecting film and comprised of a material selected from the group consisting of palladium and palladium-gold alloy.
References Cited (Backward Citations)
US3901067A
Cited
US3952567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |