Patent US2664464A successfully refreshed from Google Patents.
US2664464A
Expired / Lapsed
US
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Automatic frequency control circuit for television receivers
Assignee: Zenith Electronics LLC
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Filing: 1951-06-28
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Granted: 1953-12-29
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Expires: 1971-06-28
Abstract
No abstract record available.
Inventors
- 👤 Iii Albert Cotsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:09
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2552140A
Cited
US2553368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |