Patent US3217100A successfully refreshed from Google Patents.
US3217100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contrast control system
Assignee: RCA Corp
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Filing: 1962-01-03
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Granted: 1965-11-09
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Expires: 1982-01-03
Abstract
No abstract record available.
Inventors
- 👤 Robert W Voeckler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:17
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/57
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN A VIDEO SIGNAL PROCESSING SYSTEM RESPONSIVE TO REPETITIVE VIDEO SIGNALS HAVING AN AMPLITUDE RANGE CORRESPONDING TO DIFFERENT GRADATIONS BETWEEN PREDETERMINED LIMITS, MEANS FOR REPETITIVELY BLANKING SAID VIDEO SIGNALS TO A VALUE CORRESPONDING TO A DESIRED MINIMUM VALUE OF SAID LIMITS, MEANS FOR PRODUCING REPETITIVE PULSES HAVING AN AMPLITUDE AND POLARITY CORRESPONDING TO THE DESIRED MAXIMUM VALUE OF SAID LIMITS, MEANS FOR COMBINING SAID REPETITIVE PULSES AND SAID BLANKED VIDEO SIGNAL TO PROVIDE A COMPOSITE SIGNAL, MEANS FOR CLAMPING SAID COMPOSITE SIGNAL TO THE LEVEL OF SAID REPETITIVE PULES, AND MEANS FOR CONTROLLING THE LEVEL OF SAID COMPOSITE SIGNAL TO VARY THE CONTRAST OF SAID CLAMPED COMPOSITE SIGNAL WITHOUT SUBSTANTIALLY AFFECTING THE AMPLITUDE LIMITS THEREOF.
Claim 2
Dependent Claim
115 words
IN A VIDEO SIGNAL PROCESSING SYSTEM RESPONSIVE TO REPETITIVE VIDEO SIGNALS HAVING AN AMPLITUDE RANGE CORRESPONDING TO DIFFERENT GRADATIONS BETWEEN PREDETERMINED LIMITS, MEANS FOR REPETITIVELY BLANKING SAID VIDEO SIGNALS TO A VALUE CORRESPONDING TO A DESIRED MINIMUM VALUE OF SAID LIMITS, MEANS FOR PRODUCING REPETITIVE PULSES HAVING AN AMPLITUDE AND POLARITY CORRESPONDING TO THE DESIRED MAXIMUM VALUE OF SAID LIMITS, MEANS FOR COMBINING SAID REPETITIVE PULSES AND SAID BLANKED VIDEO SIGNAL TO PROVIDE A COMPOSITE SIGNAL, MEANS FOR CLAMPING SAID COMPOSITE SIGNAL TO THE LEVEL OF SAID REPETITIVE PULES, AND MEANS FOR CONTROLLING THE LEVEL OF SAID COMPOSITE SIGNAL TO VARY THE CONTRAST OF SAID CLAMPED COMPOSITE SIGNAL WITHOUT SUBSTANTIALLY AFFECTING THE AMPLITUDE LIMITS THEREOF.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |