US4260978A
Expired / Lapsed
US
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Gas detector element
Assignee: Soken Inc
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Filing: 1979-05-21
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Granted: 1981-04-07
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Expires: 1999-05-21
Abstract
Abstract A gas detector element comprising a sintered material of a metal oxide, the electric resistivity of which varies depending on an oxidative atmosphere or a reductive atmosphere of the inflammable gas composition, said gas detector element being characterized in that the size of the composing particles of said sintered material is in the range from 0.5μ to 5μ in an equivalent circle diameter.
Inventors
- 👤 Eturo Yasuda
- 👤 Yoshihiro Segawa
- 👤 Minoru Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:25
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
58 words
In a gas detector element comprising a sintered material of a metal oxide, the electric resistivity of which varies depending on whether the composition of the inflammable gas is an oxidative atmosphere or a reductive atmosphere, the size of the composing particles of said sintered material is in the range from 0.5μ to 5μ in equivalent circle diameter.
Claim 2
Dependent Claim
58 words
In a gas detector element comprising a sintered material of a metal oxide, the electric resistivity of which varies depending on whether the composition of the inflammable gas is an oxidative atmosphere or a reductive atmosphere, the size of the composing particles of said sintered material is in the range from 0.5μ to 5μ in equivalent circle diameter.
Claim 3
Dependent Claim
31 words
A gas detector element according to claim 1, wherein the size of the composing particles of the sintered material is in the range from 1μ to 5μ in corresponding circle diameter.
Claim 4
Dependent Claim
35 words
A gas detector element according to claim 1 or 2, wherein the material of said sintered material is selected from a group consisting of titanium oxide, zinc oxide, nickel oxide, stannic oxide and niobium oxide.
References Cited (Backward Citations)
US3932246A
Cited
EP0001511A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |