US2711516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency discriminatory systems
Assignee: RCA Corp
•
Filing: 1949-10-29
•
Granted: 1955-06-21
•
Expires: 1969-10-29
Abstract
No abstract record available.
Inventors
- 👤 Gordon L Fredendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:13
CPC Classifications
H; H04; H04N; H04N11/00; H04N11/06; H04N11/12; H03; H03H; H03H11/00; H03H11/02; H03H11/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1759952A
Cited
US1956121A
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US1902031A
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US2020409A
Cited
US2054794A
Cited
US2263519A
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US2342638A
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US2434904A
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US2550596A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-20 | 1958-12-20 | 1959-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-20 | 1962-12-20 | 1963-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-20 | 1966-12-20 | 1967-06-21 | $7700.00 | Window Closed / Lapsed |