US3341654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television signal correcting circuit arrangements
Assignee: BAE Systems Electronics Ltd
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Filing: 1964-03-26
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Granted: 1967-09-12
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Expires: 1984-03-26
Abstract
No abstract record available.
Inventors
- 👤 Pay Donald Alexander
- 👤 Deveson John Harwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:14
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N5/202
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A GAMMA CORRECTING CIRCUIT ARRANGEMENT COMPRISING MEANS FOR PRODUCING FROM INPUT VIDEO SIGNALS A MAIN SIGNAL WHOSE AMPLITUDE RATIO TO THAT OF THE INPUT SIGNAL REMAINS CONSTANT FROM "BLACK" TO "WHITE"; MEANS FOR PRODUCING FROM SAID INPUT SIGNALS AT LEAST ONE CORRECTING SIGNAL THE AMPLITUDE OF WHICH INCREASES SUBSTANTIALLY LINEARLY AT A PRE-DETERMINED FIXED RATE FROM ZERO TO AN ADJUSTABLE MAXIMUM FROM "BLACK" TO AN ADJUSTABLE VALUE OF "GREY" INTERMEDIATE BETWEEN "BLACK" AND "WHITE" THEREAFTER DECREASING SUBSTANTIALLY LINEARLY TO ZERO FOR AN INPUT SIGNAL INCREASING FROM SAID ADJUSTABLE VALUE OF GREY TO "WHITE"; AND MEANS FOR ADDING SAID CORRECTING SIGNAL TO SAID MAIN SIGNAL.
Claim 2
Dependent Claim
104 words
A GAMMA CORRECTING CIRCUIT ARRANGEMENT COMPRISING MEANS FOR PRODUCING FROM INPUT VIDEO SIGNALS A MAIN SIGNAL WHOSE AMPLITUDE RATIO TO THAT OF THE INPUT SIGNAL REMAINS CONSTANT FROM "BLACK" TO "WHITE"; MEANS FOR PRODUCING FROM SAID INPUT SIGNALS AT LEAST ONE CORRECTING SIGNAL THE AMPLITUDE OF WHICH INCREASES SUBSTANTIALLY LINEARLY AT A PRE-DETERMINED FIXED RATE FROM ZERO TO AN ADJUSTABLE MAXIMUM FROM "BLACK" TO AN ADJUSTABLE VALUE OF "GREY" INTERMEDIATE BETWEEN "BLACK" AND "WHITE" THEREAFTER DECREASING SUBSTANTIALLY LINEARLY TO ZERO FOR AN INPUT SIGNAL INCREASING FROM SAID ADJUSTABLE VALUE OF GREY TO "WHITE"; AND MEANS FOR ADDING SAID CORRECTING SIGNAL TO SAID MAIN SIGNAL.
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) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |