Patent US2641693A successfully refreshed from Google Patents.
US2641693A
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Local transmitter frequency control circuit
Assignee: STC PLC
•
Filing: 1944-11-18
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Granted: 1953-06-09
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Expires: 1964-11-18
Abstract
No abstract record available.
Inventors
- 👤 Labin Emile
- 👤 Frankel Sidney
- 👤 Silver Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:31
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/02; H03J7/04; H03L; H03L7/00; H03L7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB355705A
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US2110015A
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US2176742A
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US2137859A
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US2294942A
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US2304377A
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US2307316A
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US2403557A
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US2366076A
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US2274434A
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US2337328A
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US2419527A
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US2425981A
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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) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |