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US2640156A
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Automatic frequency control apparatus
Assignee: United States Department of the Navy
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Filing: 1945-10-31
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Granted: 1953-05-26
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Expires: 1965-10-31
Abstract
No abstract record available.
Inventors
- 👤 Howard L Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:42
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; H; H03; H03L; H03L7/00; H03L7/02; H03L7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2261800A
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US2404568A
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US2379689A
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US2434294A
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US2406125A
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US2475074A
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US2462294A
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US2510095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |