US2838671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic frequency control circuit
Assignee: Farnsworth Research Corp
•
Filing: 1952-07-10
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Granted: 1958-06-10
•
Expires: 1972-07-10
Abstract
No abstract record available.
Inventors
- 👤 Miller Meritt Lavon
- 👤 Robert W Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:17
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; H; H03; H03J; H03J7/00; H03J7/02; H03J7/04; H03J7/047
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2698904A
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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) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |