US3112424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic brightness and contrast control circuit
Assignee: US Philips Corp
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Filing: 1960-07-11
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Granted: 1963-11-26
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Expires: 1980-07-11
Abstract
No abstract record available.
Inventors
- 👤 Suhrmann Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:45
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/57; H04N5/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
IN A TELEVISION RECEIVER, AN IMAGE REPRODUCING DEVICE HAVING FIRST AND SECOND CONTROL ELECTRODES, A SOURCE OF VIDEO SIGNALS, MEANS APPLYING SAID VIDEO SIGNALS TO SAID FIRST CONTROL ELECTRODE, MEANS HAVING A CONTROL TERMINAL FOR VARYING THE AMPLITUDE OF SAID SIGNALS IN RESPONSE TO A CONTROL VOLTAGE APPLIED TO SAID TERMINAL, A SOURCE OF POTENTIAL, VOLTAGE DIVIDER MEANS COMPRISING SERIES CONNECTED FIRST RESISTOR, PHOTO CONDUCTOR, AND SECOND RESISTOR CONNECTED TO SAID SOURCE OF POTENTIAL, MEANS CONNECTING THE JUNCTION OF SAID FIRST RESISTOR AND PHOTO CONDUCTOR TO SAID CONTROL TERMINAL, THIRD RESISTOR CONNECTED IN PARALLEL WITH SAID PHOTO CONDUCTOR, SAID THIRD RESISTOR HAVING A TAP, DIODE MEANS CONNECTED BETWEEN SAID TAP AND SAID SECOND CONTROL ELECTRODE, A SOURCE OF BIAS VOLTAGE, AND RESISTOR MEANS CONNECTING SAID SOURCE OF BIAS VOLTAGE TO THE ELECTRODE OF SAID DIODE MEANS NOT CONNECTED TO SAID TAP.
Claim 2
Dependent Claim
141 words
IN A TELEVISION RECEIVER, AN IMAGE REPRODUCING DEVICE HAVING FIRST AND SECOND CONTROL ELECTRODES, A SOURCE OF VIDEO SIGNALS, MEANS APPLYING SAID VIDEO SIGNALS TO SAID FIRST CONTROL ELECTRODE, MEANS HAVING A CONTROL TERMINAL FOR VARYING THE AMPLITUDE OF SAID SIGNALS IN RESPONSE TO A CONTROL VOLTAGE APPLIED TO SAID TERMINAL, A SOURCE OF POTENTIAL, VOLTAGE DIVIDER MEANS COMPRISING SERIES CONNECTED FIRST RESISTOR, PHOTO CONDUCTOR, AND SECOND RESISTOR CONNECTED TO SAID SOURCE OF POTENTIAL, MEANS CONNECTING THE JUNCTION OF SAID FIRST RESISTOR AND PHOTO CONDUCTOR TO SAID CONTROL TERMINAL, THIRD RESISTOR CONNECTED IN PARALLEL WITH SAID PHOTO CONDUCTOR, SAID THIRD RESISTOR HAVING A TAP, DIODE MEANS CONNECTED BETWEEN SAID TAP AND SAID SECOND CONTROL ELECTRODE, A SOURCE OF BIAS VOLTAGE, AND RESISTOR MEANS CONNECTING SAID SOURCE OF BIAS VOLTAGE TO THE ELECTRODE OF SAID DIODE MEANS NOT CONNECTED TO SAID TAP.
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) | 1966-11-25 | 1967-05-27 | 1967-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-25 | 1971-05-27 | 1971-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-25 | 1975-05-27 | 1975-11-26 | $7700.00 | Window Closed / Lapsed |