Patent US3274494A successfully refreshed from Google Patents.
US3274494A
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Assignee: Teledyne Ryan Aeronautical Corp
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Filing: 1963-02-27
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Granted: 1966-09-20
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Expires: 1983-02-27
Abstract
No abstract record available.
Inventors
- 👤 Oliver C Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:39
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/18; H03J7/20; H03J7/24; H03J7/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
203 words
IN AN AUTOMATIC FREQUENCY TRACKING CIRCUIT, APPARATUS COMPRISING: AN OSCILLATOR HAVING TUNING MEANS INCLUDING A VOLTAGE VARIABLE TUNING CAPACITOR, SO THAT CHANGING VOLTAGE APPLIED TO SAID CAPACITOR CHANGES THE FREQUENCY OF THE OSCILLATOR; A FIRST CHARGING CIRCUIT CONNECTED TO CHARGE SAID CAPACITOR WHEN AN INPUT SIGNAL TO THE CHARGING CIRCUIT IS ABSENT, SAID FIRST CHARGING CIRCUIT INCLUDING A TRANSISTOR HAVING AN EMITTER CONNECTED TO GROUND, A COLLECTOR CONNECTED THROUGH A SERIES LOAD RESISTOR TO A D.C. SOURCE, AND A BASE CONNECTED TO THE OUTPUT OF A SIGNAL DETECTOR, WHEREBY SAID TRANSISTOR CUT OFF WHEN SAID SIGNAL DETECTOR HAS NO OUTPUT AND CONDUCTS WHEN SAID SIGNAL DETECTOR HAS AN OUTPUT, A ZENER DIODE CONNECTED TO SAID COLLECTOR, AND A RESISTOR CONNECTED IN SERIES WITH SAID ZENER DIODE AND SAID TUNING CAPACITOR, WHEREBY SAID ZENER DIODE CONDUCTS AND SAID TUNING CAPACITOR CHARGES WHEN SAID TRANSISTOR IS CUT OFF, AND SAID ZENER DIODE IS CUT OFF, INTERRUPTING THE CHARGING CIRCUIT, WHEN SAID TRANSISTOR CONDUCTS; A SECOND CHARGING CONNECTED TO CHARGE AND DISCHARGE SAID CAPACITOR WHEN AN INPUT SIGNAL TO SAID FIRST CHARGING CIRCUIT IS PRESENT; AND A DISCHARGE CIRCUIT CONNECTED TO DISCHARGE SAID CAPACITOR WHEN THE CHARGE FROM SAID FIRST CHARGING CIRCUIT REACHES A PREDETERMINED MAGNITUDE.
Claim 2
Dependent Claim
203 words
IN AN AUTOMATIC FREQUENCY TRACKING CIRCUIT, APPARATUS COMPRISING: AN OSCILLATOR HAVING TUNING MEANS INCLUDING A VOLTAGE VARIABLE TUNING CAPACITOR, SO THAT CHANGING VOLTAGE APPLIED TO SAID CAPACITOR CHANGES THE FREQUENCY OF THE OSCILLATOR; A FIRST CHARGING CIRCUIT CONNECTED TO CHARGE SAID CAPACITOR WHEN AN INPUT SIGNAL TO THE CHARGING CIRCUIT IS ABSENT, SAID FIRST CHARGING CIRCUIT INCLUDING A TRANSISTOR HAVING AN EMITTER CONNECTED TO GROUND, A COLLECTOR CONNECTED THROUGH A SERIES LOAD RESISTOR TO A D.C. SOURCE, AND A BASE CONNECTED TO THE OUTPUT OF A SIGNAL DETECTOR, WHEREBY SAID TRANSISTOR CUT OFF WHEN SAID SIGNAL DETECTOR HAS NO OUTPUT AND CONDUCTS WHEN SAID SIGNAL DETECTOR HAS AN OUTPUT, A ZENER DIODE CONNECTED TO SAID COLLECTOR, AND A RESISTOR CONNECTED IN SERIES WITH SAID ZENER DIODE AND SAID TUNING CAPACITOR, WHEREBY SAID ZENER DIODE CONDUCTS AND SAID TUNING CAPACITOR CHARGES WHEN SAID TRANSISTOR IS CUT OFF, AND SAID ZENER DIODE IS CUT OFF, INTERRUPTING THE CHARGING CIRCUIT, WHEN SAID TRANSISTOR CONDUCTS; A SECOND CHARGING CONNECTED TO CHARGE AND DISCHARGE SAID CAPACITOR WHEN AN INPUT SIGNAL TO SAID FIRST CHARGING CIRCUIT IS PRESENT; AND A DISCHARGE CIRCUIT CONNECTED TO DISCHARGE SAID CAPACITOR WHEN THE CHARGE FROM SAID FIRST CHARGING CIRCUIT REACHES A PREDETERMINED MAGNITUDE.
References Cited (Backward Citations)
US2838671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |