US2757233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge tube arrangements
Assignee: EMI Ltd
•
Filing: 1951-09-29
•
Granted: 1956-07-31
•
Expires: 1971-09-29
Abstract
No abstract record available.
Inventors
- 👤 Webley Reginald Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:03
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/26; H01J31/28; H01J31/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2212923A
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US2267823A
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US2324504A
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US2411155A
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US2668190A
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US2572644A
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US2495042A
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US2619531A
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US2622226A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-31 | 1960-01-30 | 1960-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-31 | 1964-01-30 | 1964-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-31 | 1968-01-30 | 1968-07-31 | $7700.00 | Window Closed / Lapsed |