Patent US3277318A successfully refreshed from Google Patents.
US3277318A
Expired / Lapsed
US
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Gamma correction circuits
Assignee: General Electric Co
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Filing: 1964-04-30
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Granted: 1966-10-04
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Expires: 1984-04-30
Abstract
No abstract record available.
Inventors
- 👤 Alan D Bedford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:11
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N5/202
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
GAMMA CORRECTION CIRCUITRY FOR POSITIONING BETWEEN FIRST AND SECOND VIDEO STAGES IN A TELEVISION SYSTEM, SAID CIRCUIT COMPRISING: (A) A SERIES DRIVING IMPEDANCE CONNECTED BETWEEN THE OUTPUT OF SAID FIRST VIDEO STAGE AND THE INPUT OF SAID SECOND VIDEO STAGE, (B) AN ADDER IMPEDANCE, (C) A LOGIC ELEMENT HAVING FIRST, SECOND, AND THIRD TERMINALS, SAID FIRST TERMINAL BEING CONNECTED TO THE INPUT OF SAID SECOND VIDEO STAGE THROUGH SAID IMPEDANCE, (D) SAID SECOND TERMINAL BEING CONNECTED TO THE OUTPUT OF SAID FIRST VIDEO STAGE, (E) SAID THIRD TERMINAL BEING CONNECTED TO AN A.C. GROUND AND HAVING A D.C. REFERENCE POTENTIAL APPLIED THERETO, (F) SAID LOGIC ELEMENT INCLUDING MEANS RESPONSIVE TO THE RELATIVE MAGNITUDES OF THE REFERENCE POTENTIAL AND THE VOLTAGE AT THE OUTPUT OF SAID FIRST VIDEO STAGE TO SELECTIVELY CONNECT THE FIRST TERMINAL OF SAID LOGIC ELEMENT TO EITHER OF SAID SECOND AND THIRD TERMINALS IN SUCH A MANNER THAT SAID ADDER IMPEDANCE IS CONNECTED
Claim 2
Dependent Claim
156 words
GAMMA CORRECTION CIRCUITRY FOR POSITIONING BETWEEN FIRST AND SECOND VIDEO STAGES IN A TELEVISION SYSTEM, SAID CIRCUIT COMPRISING: (A) A SERIES DRIVING IMPEDANCE CONNECTED BETWEEN THE OUTPUT OF SAID FIRST VIDEO STAGE AND THE INPUT OF SAID SECOND VIDEO STAGE, (B) AN ADDER IMPEDANCE, (C) A LOGIC ELEMENT HAVING FIRST, SECOND, AND THIRD TERMINALS, SAID FIRST TERMINAL BEING CONNECTED TO THE INPUT OF SAID SECOND VIDEO STAGE THROUGH SAID IMPEDANCE, (D) SAID SECOND TERMINAL BEING CONNECTED TO THE OUTPUT OF SAID FIRST VIDEO STAGE, (E) SAID THIRD TERMINAL BEING CONNECTED TO AN A.C. GROUND AND HAVING A D.C. REFERENCE POTENTIAL APPLIED THERETO, (F) SAID LOGIC ELEMENT INCLUDING MEANS RESPONSIVE TO THE RELATIVE MAGNITUDES OF THE REFERENCE POTENTIAL AND THE VOLTAGE AT THE OUTPUT OF SAID FIRST VIDEO STAGE TO SELECTIVELY CONNECT THE FIRST TERMINAL OF SAID LOGIC ELEMENT TO EITHER OF SAID SECOND AND THIRD TERMINALS IN SUCH A MANNER THAT SAID ADDER IMPEDANCE IS CONNECTED
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |