Patent US3676820A successfully refreshed from Google Patents.
US3676820A
Expired / Lapsed
US
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Gas detecting element and method of manufacturing same
Assignee: Individual
•
Filing: 1970-01-30
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Granted: 1972-07-11
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Expires: 1990-01-30
Abstract
Abstract A gas detecting element formed of a semiconductor material capable of adsorbing gases and exhibiting a relatively high change in electrical conductivity, the semiconductor material containing gold, gold oxide or a compound convertible into gold or gold oxide after mixture with said semiconductor material and the method for making such an improved detector.
Inventors
- 👤 Naoyoshi Taguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:33
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
19 words
A gas detecting element according to claim 1 wherein said semiconductor body is enclosed within a reinforcing porous material.
Claim 2
Dependent Claim
76 words
A gas detecting element comprising a semiconductor material capable of absorbing gases and exhibiting a resultant change in electrical conductivity, said semiconductor material being intermixed with a material selected from the group consisting of gold, gold oxide, and a compound convertible into gold or gold oxide after mixture with said semiconductor material, said semiconductor material being enclosed within a porous material, said porous material being selected from the group consisting of asbestos, glass fibers and cement.
Claim 3
Dependent Claim
69 words
A gas detecting element comprising a semiconductor material capable of absorbing gases and exhibiting a resultant change in electrical conductivity, said semiconductor material being intermixed with a material selected from the group consisting of gold, gold oxide, and a compound convertible into gold or gold oxide after mixture with said semiconductor material, said semiconductor material being highly porous and containing a heater and an electrode spaced from said heater.
Claim 4
Independent Claim
64 words
The method of making a gas detecting element comprising forming a heater and an electrode, forming a mixture of paraffin and a semiconductor material containing a material selected from the group consisting of gold, gold oxide, and a compound convertible into gold or gold oxide, enclosing said heater and electrode with said mixture and then heating said heater and electrode to remove said paraffin.
Claim 5
Dependent Claim
29 words
The method according to claim 5 including the step of coating said detecting element with a porous material selected from the group consisting of asbestos, glass fibers and cement.
Claim 6
Dependent Claim
39 words
The method according to claim 6 wherein said porous material is mixed with aluminum hydroxide and water and said process includes the step of heating said coating to evaporate the water and convert said aluminum hydroxide to aluminum oxide.
Claim 7
Dependent Claim
21 words
The method according to claim 6 including the step of coating said semiconductor material with a thin film of polyvinyl alcohol.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |