US3178654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic frequency control system having an electrically tunable resonant circuit as a frequency reference element
Assignee: General Electric Co
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Filing: 1961-11-29
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Granted: 1965-04-13
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Expires: 1981-11-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Joe B Linker
- 👤 Farokhrooz Azatollah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:48
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/02; H03L7/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
AN AUTOMATIC FREQUENCY CONTROL SYSTEM COMPRISING, (A) A VOLTAGE SENSITIVE OSCILLATOR, (B) A VARIABLE VOILTAGE SOURCE COUPLED TO SAID OSCILLATOR, SAID SOURCE PROVIDING OPERATING VOLTAGE FOR AND CONTROLLING THE FREQUENCY OF SAID OSCILLATOR, (C) A VARIABLE ELECTRICALLY TURNABLE RESONANT FREQUENCY REFERENCE ELEMENT, (D) MEANS TO APPLY A PORTION OF THE OSCILLATOR OUTPUT TO SAID REFERENCE ELEMENT, (E) MODULATING MEANS FOR ABRUPTLY SHIFTING THE RESONANT FREQUENCY OF SAID REFERENCE ELEMENT IN RESPONSE TO A MODULATING SIGNAL BETWEEN TWO DISCRETE VALUES ABOVE AND BELOW THE DESIRED OSCILLATOR FREQUENCY WITHOUT SHIFTING THE FREQUENCY TO ANY INTERMEDIATE VALUES TO AMPLITUDE MODULATE THE APPLIED OSCILLATOR SIGNAL IN RESPONSE TO DEPARTURES FROM THE DESIRED FREQUENCY, (F) MEANS TO PRODUCE A CONTROL SIGNAL BY COMPARING SAID MODULATED OSCILLATOR SIGNAL WITH A SIGNAL RELATED IN PHASE TO SAID MODULATING SIGNAL, (G) MEANS TO VARY VOLTAGE OUTPUT OF SAID VOLTAGE SOURCE IN RESPONSE TO SAID CONTROL SIGNAL TO CORRECT THE FREQUENCY DEPARTURE OF SAID OSCILLATOR FROM THE DESIRED VALUE.
Claim 2
Dependent Claim
160 words
AN AUTOMATIC FREQUENCY CONTROL SYSTEM COMPRISING, (A) A VOLTAGE SENSITIVE OSCILLATOR, (B) A VARIABLE VOILTAGE SOURCE COUPLED TO SAID OSCILLATOR, SAID SOURCE PROVIDING OPERATING VOLTAGE FOR AND CONTROLLING THE FREQUENCY OF SAID OSCILLATOR, (C) A VARIABLE ELECTRICALLY TURNABLE RESONANT FREQUENCY REFERENCE ELEMENT, (D) MEANS TO APPLY A PORTION OF THE OSCILLATOR OUTPUT TO SAID REFERENCE ELEMENT, (E) MODULATING MEANS FOR ABRUPTLY SHIFTING THE RESONANT FREQUENCY OF SAID REFERENCE ELEMENT IN RESPONSE TO A MODULATING SIGNAL BETWEEN TWO DISCRETE VALUES ABOVE AND BELOW THE DESIRED OSCILLATOR FREQUENCY WITHOUT SHIFTING THE FREQUENCY TO ANY INTERMEDIATE VALUES TO AMPLITUDE MODULATE THE APPLIED OSCILLATOR SIGNAL IN RESPONSE TO DEPARTURES FROM THE DESIRED FREQUENCY, (F) MEANS TO PRODUCE A CONTROL SIGNAL BY COMPARING SAID MODULATED OSCILLATOR SIGNAL WITH A SIGNAL RELATED IN PHASE TO SAID MODULATING SIGNAL, (G) MEANS TO VARY VOLTAGE OUTPUT OF SAID VOLTAGE SOURCE IN RESPONSE TO SAID CONTROL SIGNAL TO CORRECT THE FREQUENCY DEPARTURE OF SAID OSCILLATOR FROM THE DESIRED VALUE.
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) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |