Patent US2681414A successfully refreshed from Google Patents.
US2681414A
Expired / Lapsed
US
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Automatic frequency control circuit
Assignee: United States Department of the Navy
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Filing: 1946-02-01
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Granted: 1954-06-15
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Expires: 1966-02-01
Abstract
No abstract record available.
Inventors
- 👤 Malcom W P Strandberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:09
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/02; H03J7/04; H03J7/047
Claims Analysis
Total Claims: 0
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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) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |