Patent US2561817A successfully refreshed from Google Patents.
US2561817A
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US
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Automatic frequency control circuit
Assignee: Avco Manufacturing Corp
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Filing: 1950-02-02
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Granted: 1951-07-24
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Expires: 1970-02-02
Abstract
No abstract record available.
Inventors
- 👤 Norman W Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:39
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/04; H04N5/12; H04N5/126
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB479874A
Cited
US2248549A
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US2250708A
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US2288025A
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US2335265A
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US2521058A
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US2492090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |