US2201345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic valve repeating arrangement
Assignee: EMI Ltd
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Filing: 1938-05-07
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Granted: 1940-05-21
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Expires: 1958-05-07
Abstract
No abstract record available.
Inventors
- 👤 Percival William Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:53
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/62; H03F3/64; H03F1/00; H03F1/08; H03F1/14; H03F1/16; H03F3/42; H03F3/44
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) | 1943-05-21 | 1943-11-20 | 1944-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-21 | 1947-11-20 | 1948-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-21 | 1951-11-20 | 1952-05-21 | $7700.00 | Window Closed / Lapsed |