US3187095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contrast control arrangement for television receivers providing nonlinear gray scale
Assignee: International Standard Electric Corp
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Filing: 1961-10-20
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Granted: 1965-06-01
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Expires: 1981-10-20
Abstract
No abstract record available.
Inventors
- 👤 Rappold Armin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:54
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/50; G; G08; G08C; G08C17/00; G08C17/02; H03; H03D; H03D13/00; H03D13/007; H03D13/009; H03J; H03J3/00; H03J7/00; H03J7/02; H03J7/04; H04N5/04; H04N5/12; H04N5/126; H04N5/14; H04N5/20; H04N5/57; H04N5/58; H04N9/00; H04N9/44; H04N9/455
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
IN A TELEVISION RECEIVER, A CONTRAST CONTROL ARRANGEMENT COMPRISING A FIRST MEANS HAVING A LINEAR CONTRAST CONTROL CHARACTERISTIC BETWEEN THE BLOCK AND WHILE LEVELS OF A TELEVISION SIGNAL, AND A SECOND MEANS SELECTIVELY COUPLED TO SAID FIRST MEANS TO MODIFY AND CONTRAST CONTROL CHARACTERISTIC TO INCLUDE A FIRST PORTION EXTENDING FROM A FIRST POINT DISPOSED IN JUXTAPOSITION TO THE ONE QUARTER POINT OF THE ENTIRE RANGE BETWEEN SAID BLACK LEVEL AND SAID WHITE LEVEL TO A SECOND POINT DISPOSED IN JUXTAPOSITION TO THE ONE HALF POINT OF SAID ENTIRE RANGE HAVING A SLOPE STEEPER THAN THE SLOPE OF SAID LINEAR CHARACTERISTIC AND A SECOND PORTION EXTENDING FOR THE REMAINDER OF SAID MODIFIED CHARACTERISTIC HAVING A SLOPE LESS THAN THE SLOPE OF SAID LINEAR CHARACTERISTIC WHEREBY THE VALUE OF THE WHITE LEVEL OF SAID MODIFIED CHARACTERISTIC IN LOWER THAN THE VALUE OF THE WHITE LEVEL OF SAID LINEAR CHARACTERISTIC.
Claim 2
Dependent Claim
148 words
IN A TELEVISION RECEIVER, A CONTRAST CONTROL ARRANGEMENT COMPRISING A FIRST MEANS HAVING A LINEAR CONTRAST CONTROL CHARACTERISTIC BETWEEN THE BLOCK AND WHILE LEVELS OF A TELEVISION SIGNAL, AND A SECOND MEANS SELECTIVELY COUPLED TO SAID FIRST MEANS TO MODIFY AND CONTRAST CONTROL CHARACTERISTIC TO INCLUDE A FIRST PORTION EXTENDING FROM A FIRST POINT DISPOSED IN JUXTAPOSITION TO THE ONE QUARTER POINT OF THE ENTIRE RANGE BETWEEN SAID BLACK LEVEL AND SAID WHITE LEVEL TO A SECOND POINT DISPOSED IN JUXTAPOSITION TO THE ONE HALF POINT OF SAID ENTIRE RANGE HAVING A SLOPE STEEPER THAN THE SLOPE OF SAID LINEAR CHARACTERISTIC AND A SECOND PORTION EXTENDING FOR THE REMAINDER OF SAID MODIFIED CHARACTERISTIC HAVING A SLOPE LESS THAN THE SLOPE OF SAID LINEAR CHARACTERISTIC WHEREBY THE VALUE OF THE WHITE LEVEL OF SAID MODIFIED CHARACTERISTIC IN LOWER THAN THE VALUE OF THE WHITE LEVEL OF SAID LINEAR CHARACTERISTIC.
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) | 1968-05-31 | 1968-11-30 | 1969-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-31 | 1972-11-30 | 1973-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-31 | 1976-11-30 | 1977-06-01 | $7700.00 | Window Closed / Lapsed |