Patent US2853549A successfully refreshed from Google Patents.
US2853549A
Expired / Lapsed
US
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High level contrast control for video amplifiers
Assignee: RCA Corp
•
Filing: 1951-03-30
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Granted: 1958-09-23
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Expires: 1971-03-30
Abstract
No abstract record available.
Inventors
- 👤 Bethel E Denton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:38
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/57; H04N5/04; H04N5/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2236066A
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US2234830A
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CH246035A
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US2552022A
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US2656413A
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US2505367A
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US2540646A
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US2584332A
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US2718551A
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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) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |