US3567383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen detectors
Assignee: Engelhard Minerals and Chemicals Corp
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Filing: 1968-10-01
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Granted: 1971-03-02
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Expires: 1988-10-01
Abstract
Abstract A DETECTOR FOR HYDROGEN HAS AS ITS SENSING DEVICE A THIN FILM COMPRISED OF PALLADIUM OR PLATINUM OXIDE WHICH OXIDE ON CONTACT WITH HYDROGEN REDUCES TO THE CORRESPONDING METAL DIFFERENCES IN PROPERTIES, E.G. ELECTRICAL OR OPTI- CAL, OF THE OXIDE AND METALLIC FILMS ARE USED TO DETECT THE PRESENCE OF HYDROGEN.
Inventors
- 👤 Robert C Langley
- 👤 Leonard R Rubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:07
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/16; G01M3/042; G01M3/045; G01M3/20; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |