US2651673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency discriminatory system
Assignee: RCA Corp
•
Filing: 1949-09-20
•
Granted: 1953-09-08
•
Expires: 1969-09-20
Abstract
No abstract record available.
Inventors
- 👤 Gordon L Fredendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:12
CPC Classifications
H; H04; H04N; H04N11/00; H04N11/06; H04N11/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1759952A
Cited
US1902031A
Cited
US2272638A
Cited
US2335180A
Cited
US2387783A
Cited
US2461515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |