Patent US3611243A successfully refreshed from Google Patents.
US3611243A
Expired / Lapsed
US
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Element for the determination of the partial oxygen pressure
Assignee: US Philips Corp
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Filing: 1969-04-01
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Granted: 1971-10-05
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Expires: 1989-04-01
Abstract
Abstract An apparatus for determining partial oxygen pressure in a gas mixture by the measurement of electrical conductivity of titanium dioxide doped to have N-type conductivity and exposed to the gas.
Inventors
- 👤 Karl Heinz Hardtl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:40
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4073; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
13 words
The apparatus of claim 1 wherein the metal ions are pentavalent niobium ions.
References Cited (Backward Citations)
US3033907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |