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US3396236A
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Automatic black-level control circuit
Assignee: Fairchild Semiconductor Corp
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Filing: 1965-06-07
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Granted: 1968-08-06
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Expires: 1985-06-07
Abstract
No abstract record available.
Inventors
- 👤 Herbert R Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:21
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/16; H04N5/165
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
AN AUTOMATIC BLACK-LEVEL CONTROL CIRCUIT FOR AN ELECTRONIC SCANNING CAMERA DEVELOPING A POSITIVE VIDEO SIGNAL COMPRISING: AN INPUT CIRCUIT FOR SUPPLYING A CAMERA-DEVELOPED VIDEO SIGNAL; MEANS FOR INVERTING THE POLARITY OF AN INPUT SIGNAL; MEANS FOR STABILIZING THE INVERTED SIGNAL ON ITS PEAK BLACK LEVEL; MEANS FOR INVERTING THE POLARITY OF THE STABILIZED SIGNAL; AND AN OUTPUT CIRCUIT COUPLED TO SAID INVERTING MEANS.
Claim 2
Dependent Claim
63 words
AN AUTOMATIC BLACK-LEVEL CONTROL CIRCUIT FOR AN ELECTRONIC SCANNING CAMERA DEVELOPING A POSITIVE VIDEO SIGNAL COMPRISING: AN INPUT CIRCUIT FOR SUPPLYING A CAMERA-DEVELOPED VIDEO SIGNAL; MEANS FOR INVERTING THE POLARITY OF AN INPUT SIGNAL; MEANS FOR STABILIZING THE INVERTED SIGNAL ON ITS PEAK BLACK LEVEL; MEANS FOR INVERTING THE POLARITY OF THE STABILIZED SIGNAL; AND AN OUTPUT CIRCUIT COUPLED TO SAID INVERTING MEANS.
References Cited (Backward Citations)
US2173497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-06 | 1972-02-05 | 1972-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-06 | 1976-02-05 | 1976-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-06 | 1980-02-05 | 1980-08-06 | $7700.00 | Window Closed / Lapsed |