Patent US1822658A successfully refreshed from Google Patents.
Patent US2463685A successfully refreshed from Google Patents.
US2463685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic frequency control system
Assignee: RCA Corp
•
Filing: 1944-07-31
•
Granted: 1949-03-08
•
Expires: 1964-07-31
Abstract
No abstract record available.
Inventors
- 👤 Gordon L Fredendall
- 👤 Alfred C Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:42
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/04; H04N5/12; H04N5/126
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2066528A
Cited
US2096881A
Cited
US2250284A
Cited
US2339536A
Cited
US2358545A
Cited
US2332681A
Cited
US2344810A
Cited
US2352541A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-03-07 | 1952-09-06 | 1953-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-03-07 | 1956-09-06 | 1957-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-03-07 | 1960-09-06 | 1961-03-08 | $7700.00 | Window Closed / Lapsed |