US2921210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen diffusion detection apparatus
Assignee: Pure Oil Co
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Filing: 1957-09-30
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Granted: 1960-01-12
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Expires: 1977-09-30
Abstract
No abstract record available.
Inventors
- 👤 Schaschl Edward
- 👤 Glenn A Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:30
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/62; G01N27/68; G01N27/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
AN ELECTRON TUBE COMPRISING CATHODE, PLATE, AND GRID ELEMENTS SUPPORTED ON AN INSULATED BASE AND ENCLOSED BY A SHELL EVACUATED TO A HIGH VACUUM, IN WHICH SAID SHELL COMPRISES A HOLLOW, CLOSED-END TUBE OF A MATERIAL HIGHLY PERMEABLE TO HYDROGEN AND HAVING A THIN EXTERNAL COATING OF CORRODIBLE METAL, LESS NOBLE THAN HYDROGEN, THEREON.
Claim 2
Dependent Claim
54 words
AN ELECTRON TUBE COMPRISING CATHODE, PLATE, AND GRID ELEMENTS SUPPORTED ON AN INSULATED BASE AND ENCLOSED BY A SHELL EVACUATED TO A HIGH VACUUM, IN WHICH SAID SHELL COMPRISES A HOLLOW, CLOSED-END TUBE OF A MATERIAL HIGHLY PERMEABLE TO HYDROGEN AND HAVING A THIN EXTERNAL COATING OF CORRODIBLE METAL, LESS NOBLE THAN HYDROGEN, THEREON.
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) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |