US4045764A
Expired / Lapsed
US
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Gas-sensing material
Assignee: Toshiba Corp
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Filing: 1975-10-10
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Granted: 1977-08-30
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Expires: 1995-10-10
Abstract
Abstract A gas-sensing material for detecting the presence particularly of hydrocarbon gases which is characterized by being formed of a sinter containing 20 to 99.85 mol % of ZnO, 0.1 to 50 mol % of MgO and 0.05 to 30 mol % of Me 2 O 3 (Me denotes at least one element selected from the group consisting of gallium (Ga), boron (B), indium (In), iron (Fe), aluminium (Al) and chromium (Cr)), or another sinter prepared by blending 0.01 to 10% by weight of platinum (Pt) to the above-mentioned composition.
Inventors
- 👤 Noboru Ichinose
- 👤 Yuji Yokomizo
- 👤 Masaki Katsura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:17
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; H01C17/06546
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
55 words
A gas-sensing material which comprises a sinter consisting essentially of 20 to 99.85 mol % of ZnO, 0.1 to 50 mol % of MgO and 0.05 to 30 mol % of Me 2 O 3 wherein, Me is at least one element selected from the group consisting of gallium, boron, indium, iron, aluminum and chromium.
Claim 2
Dependent Claim
55 words
A gas-sensing material which comprises a sinter consisting essentially of 20 to 99.85 mol % of ZnO, 0.1 to 50 mol % of MgO and 0.05 to 30 mol % of Me 2 O 3 wherein, Me is at least one element selected from the group consisting of gallium, boron, indium, iron, aluminum and chromium.
Claim 3
Dependent Claim
27 words
The gas-sensing material according to claim 1, wherein the proportion of the Me 2 O 3 component is chosen to range from 1 to 15 mol %.
Claim 4
Dependent Claim
33 words
The gas-sensing material according to claim 1, wherein Me 2 O 3 is at least one compound selected from the group consisting of Fe 2 O 3 and Cr 2 0 3 .
Claim 5
Dependent Claim
33 words
The gas-sensing material according to claim 1, wherein Me 2 O 3 is at least one compound selected from the group consisting of Ga 2 O 3 and In 2 O 3 .
Claim 6
Dependent Claim
20 words
The gas-sensing material according to claim 1, wherein Me 2 O 3 is at least B 2 O 3 .
Claim 7
Dependent Claim
20 words
The gas-sensing material according to claim 1, wherein Me 2 O 3 is at least Al 2 O 3 .
Claim 8
Dependent Claim
79 words
A gas-sensing material which comprises a sinter consisting essentially of 20 to 99.85 mol % of ZnO, 0.1 to 50 mol % of MgO, 0.05 to 30 mol % of Me 2 O 3 , wherein Me is at least one element selected from the group consisting of gallium, boron, indium, iron, aluminum and chromium, and from 0.01 to 10 weight % of platinum based on the total amount of said ZnO, MgO and Me 2 O 3 .
Claim 9
Dependent Claim
79 words
A gas-sensing material which comprises a sinter consisting essentially of 20 to 99.85 mol % of ZnO, 0.1 to 50 mol % of MgO, 0.05 to 30 mol % of Me 2 O 3 , wherein Me is at least one element selected from the group consisting of gallium, boron, indium, iron, aluminum and chromium, and from 0.01 to 10 weight % of platinum based on the total amount of said ZnO, MgO and Me 2 O 3 .
Claim 10
Dependent Claim
16 words
The gas-sensing material according to claim 7, which contains 0.1 to 1% by weight of platinum.
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) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |