US2688085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic frequency control
Assignee: RCA Corp
•
Filing: 1950-03-22
•
Granted: 1954-08-31
•
Expires: 1970-03-22
Abstract
No abstract record available.
Inventors
- 👤 Eugene O Keizer
- 👤 Hugh L Donley
- 👤 Wentworth Chandler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:29
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/02; H03J7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1994228A
Cited
US2019765A
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US2210406A
Cited
US2233198A
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US2243921A
Cited
US2473556A
Cited
US2461307A
Cited
US2483070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |