US2820110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit-arrangement for controlling the gradation of picture signals
Assignee: US Philips Corp
•
Filing: 1953-04-30
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Granted: 1958-01-14
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Expires: 1973-04-30
Abstract
No abstract record available.
Inventors
- 👤 Valeton Josue Jean Philippe
- 👤 Franciscus Henricus Jozef Poel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:15
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1550684A
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US2074047A
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US2252613A
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US2378999A
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US2577506A
Cited
US2646469A
Cited
US2646472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |