US3240875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unitary control providing complementary contrast and brightness changes
Assignee: RCA Corp
•
Filing: 1963-05-06
•
Granted: 1966-03-15
•
Expires: 1983-05-06
Abstract
No abstract record available.
Inventors
- 👤 Lucius P Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:13
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/57
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A UNITARY BRIGHTNESS AND CONTRAST CONTROL ARRANGEMENT FOR A TELEVISION RECEIVER HAVING AN IMAGE DISPLAY DEVICE, IN COMBINATION, A VIDEO OUTPUT STAGE OF THE TELEVISION RECEIVER FOR APPLYING VIDEO SIGNALS TO THE IMAGE DISPLAY DEVICE; A SOURCE OF D.C. OPERATING POTENTIAL FOR SAID OUTPUT STAGE; VARIABLE IMPEDANCE MEANS ARRANGED IN CIRCUIT BETWEEN SAID SOURCE OF OPERATING POTENTIAL AND SAID OUTPUT STAGE FOR VARYING THE AMPLITUDE OF SAID VIDEO SIGNALS TRANSMITTED TO THE IMAGE DISPLAY DEVICE IN ACCORDANCE WITH VARIATIONS OF ITS IMPEDANCE; A.C. COUPLING MEANS FOR COUPLING SAID VIDEO SIGNALS FROM SAID VARIABLE IMPEDANCE MEANS TO THE IMAGE DISPLAY DEVICE; AND D.C. COUPLING MEANS ARRANGED BETWEEN SAID VARIABLE IMPEDANCE MEANS AND THE IMAGE DISPLAY DEVICE FOR APPLYING D.C. POTENTIAL FROM SAID SOURCE TO THE IMAGE DISPLAY DEVICE, WHEREBY VARIATION OF SAID IMPEDANCE OF SAID VARIABLE IMPEDANCE MEANS PRODUCES COMPLEMENTARY CHANGES IN THE VIDEO SIGNAL AND THE D.C. POTENTIAL APPLIED TO THE IMAGE DISPLAY DEVICE.
Claim 2
Dependent Claim
154 words
A UNITARY BRIGHTNESS AND CONTRAST CONTROL ARRANGEMENT FOR A TELEVISION RECEIVER HAVING AN IMAGE DISPLAY DEVICE, IN COMBINATION, A VIDEO OUTPUT STAGE OF THE TELEVISION RECEIVER FOR APPLYING VIDEO SIGNALS TO THE IMAGE DISPLAY DEVICE; A SOURCE OF D.C. OPERATING POTENTIAL FOR SAID OUTPUT STAGE; VARIABLE IMPEDANCE MEANS ARRANGED IN CIRCUIT BETWEEN SAID SOURCE OF OPERATING POTENTIAL AND SAID OUTPUT STAGE FOR VARYING THE AMPLITUDE OF SAID VIDEO SIGNALS TRANSMITTED TO THE IMAGE DISPLAY DEVICE IN ACCORDANCE WITH VARIATIONS OF ITS IMPEDANCE; A.C. COUPLING MEANS FOR COUPLING SAID VIDEO SIGNALS FROM SAID VARIABLE IMPEDANCE MEANS TO THE IMAGE DISPLAY DEVICE; AND D.C. COUPLING MEANS ARRANGED BETWEEN SAID VARIABLE IMPEDANCE MEANS AND THE IMAGE DISPLAY DEVICE FOR APPLYING D.C. POTENTIAL FROM SAID SOURCE TO THE IMAGE DISPLAY DEVICE, WHEREBY VARIATION OF SAID IMPEDANCE OF SAID VARIABLE IMPEDANCE MEANS PRODUCES COMPLEMENTARY CHANGES IN THE VIDEO SIGNAL AND THE D.C. POTENTIAL APPLIED TO THE IMAGE DISPLAY DEVICE.
References Cited (Backward Citations)
US2522967A
Cited
US3136849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |