US2912794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron tube
Assignee: GTE Sylvania Inc
•
Filing: 1956-11-29
•
Granted: 1959-11-17
•
Expires: 1976-11-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Joseph S Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:28
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/36; C; C03; C03C; C03C27/00; C03C27/02; Y; Y10; Y10T; Y10T403/00; Y10T403/44; Y10T403/447; Y10T403/47; Y10T403/477
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1579626A
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US2197511A
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DE696106C
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US2483940A
Cited
US2486065A
Cited
US2575448A
Cited
US2553749A
Cited
US2656404A
Cited
US2676196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |