Patent US3602644A successfully refreshed from Google Patents.
US3602644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
"circuit for generating video markers from potentials to be measured"
Assignee: US Philips Corp
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Filing: 1969-03-05
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Granted: 1971-08-31
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Expires: 1989-03-05
Abstract
Abstract A circuit for generating a marker, such as a stripe, on a television screen to measure a potential, such as a power supply or AGC voltage, features a Schmitt trigger circuit. This circuit has two inputs for the measured voltage and the horizontal flyback pulse. Another embodiment features two trigger circuits, with the second circuit receiving the vertical flyback and another measured voltage. The output of the second circuit blocks the first circuit.
Inventors
- 👤 Marcel Rognon
- 👤 Raymond Salvy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:58
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
A circuit comprising television horizontal and vertical frequency image mark generators each having input means for receiving respective potentials to be measured; each of said generators comprising a Schmitt trigger circuit including two transistors each having emitter, base, and collector electrodes, the base of one of said transistors being coupled to the collector of another of said transistors, the emitters of said transistors being coupled together; and means for blocking said horizontal frequency generator upon the occurrence of an output signal from said vertical frequency generator comprising means for coupling the base of one of the transistors of said horizontal frequency generator to the collector of the output transistor of said vertical frequency generator.
Claim 2
Dependent Claim
114 words
A circuit comprising television horizontal and vertical frequency image mark generators each having input means for receiving respective potentials to be measured; each of said generators comprising a Schmitt trigger circuit including two transistors each having emitter, base, and collector electrodes, the base of one of said transistors being coupled to the collector of another of said transistors, the emitters of said transistors being coupled together; and means for blocking said horizontal frequency generator upon the occurrence of an output signal from said vertical frequency generator comprising means for coupling the base of one of the transistors of said horizontal frequency generator to the collector of the output transistor of said vertical frequency generator.
Claim 3
Dependent Claim
17 words
A circuit as claimed in claim 1 wherein said potentials comprise television tuning and supply voltages respectively.
Claim 4
Dependent Claim
62 words
A circuit as claimed in claim 1 further comprising a comparison circuit coupled between one of said potentials to be measured and one of said generators having an input means for receiving one of said potentials to be measured, an output means coupled to one of said generator input means, and a reference voltage source coupled to said comparison circuit input means.
Claim 5
Dependent Claim
23 words
A circuit as claimed in claim 3 wherein said reference voltage source comprises a Zener diode and a resistor coupled in series therewith.
Claim 6
Dependent Claim
18 words
A circuit as claimed in claim 3, wherein said comparison circuit further comprises an input level adjustment means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |