US3544709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dc restoration and gamma correction system
Assignee: GTE Sylvania Inc
•
Filing: 1968-04-26
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Granted: 1970-12-01
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Expires: 1988-04-26
Abstract
No abstract record available.
Inventors
- 👤 Robert Roy Eckenbrecht
- 👤 George Cleveland Waybright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:28
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/222; H04N5/257; H04N5/14; H04N5/16; H04N5/165; H04N9/00; H04N9/64; H04N9/68; H04N9/69; H04N9/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |