US3290603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency control system
Assignee: TDK Micronas GmbH
•
Filing: 1958-09-08
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Granted: 1966-12-06
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Expires: 1978-09-08
Abstract
No abstract record available.
Inventors
- 👤 Rabow Gerald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:02
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/18; H03J7/30; H03J7/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
AN AUTOMATIC FREQUENCY SEARCH AND CONTROL SYSTEM FOR A SUPERHETERODYNE RECEIVER CAPABLE OF OPERATION ON EITHER THE UPPER SIDEBAND OR LOWER SIDEBAND WHICH INCLUDES A MIXER COUPLED TO A SOURCE OF INPUT SIGNALS, AN OSCILLATOR AND AN INTERMEDIATE FREQUENCY AMPLIFIER COUPLED TO SAID MIXER AND A DETECTOR COUPLED TO SAID INTERMEDIATE FREQUENCY AMPLIFIER, SAID SYSTEM BEING ADAPTED TO TUNE SAID OSCILLATOR OVER A GIVEN FREQUENCY RANGE AND TO HALT SAID TUNING WHEN THE OSCILLATOR FREQUENCY BEARS A PREDETERMINED RELATIONSHIP TO THE FREQUENCY OF SAID INPUT SIGNAL, MEANS TO FREQUENCY MODULATED THE OUTPUT OF SAID OSCILLATOR WITH A REFERENCE SIGNAL, MEANS COUPLED TO SAID DETECTOR AND RESPONSIVE TO DETECTION OF AN INPUT SIGNAL FROM SAID SOURCE, WHICH IS INDICATIVE THAT SAID PREDETERMINED RELATIONSHIP HAS BEEN ATTAINED, TO HALT THE TUNING OF SAID OSCILLATOR, AND MEANS TO DETECT FROM THE OUTPUT OF SAID INTERMEDIATE FREQUENCY AMPLIFIER SAID REFERENCE SIGNAL AND RESPONSIVE TO AN ERROR SIGNAL INDICATIVE
Claim 2
Dependent Claim
154 words
AN AUTOMATIC FREQUENCY SEARCH AND CONTROL SYSTEM FOR A SUPERHETERODYNE RECEIVER CAPABLE OF OPERATION ON EITHER THE UPPER SIDEBAND OR LOWER SIDEBAND WHICH INCLUDES A MIXER COUPLED TO A SOURCE OF INPUT SIGNALS, AN OSCILLATOR AND AN INTERMEDIATE FREQUENCY AMPLIFIER COUPLED TO SAID MIXER AND A DETECTOR COUPLED TO SAID INTERMEDIATE FREQUENCY AMPLIFIER, SAID SYSTEM BEING ADAPTED TO TUNE SAID OSCILLATOR OVER A GIVEN FREQUENCY RANGE AND TO HALT SAID TUNING WHEN THE OSCILLATOR FREQUENCY BEARS A PREDETERMINED RELATIONSHIP TO THE FREQUENCY OF SAID INPUT SIGNAL, MEANS TO FREQUENCY MODULATED THE OUTPUT OF SAID OSCILLATOR WITH A REFERENCE SIGNAL, MEANS COUPLED TO SAID DETECTOR AND RESPONSIVE TO DETECTION OF AN INPUT SIGNAL FROM SAID SOURCE, WHICH IS INDICATIVE THAT SAID PREDETERMINED RELATIONSHIP HAS BEEN ATTAINED, TO HALT THE TUNING OF SAID OSCILLATOR, AND MEANS TO DETECT FROM THE OUTPUT OF SAID INTERMEDIATE FREQUENCY AMPLIFIER SAID REFERENCE SIGNAL AND RESPONSIVE TO AN ERROR SIGNAL INDICATIVE
References Cited (Backward Citations)
US1952463A
Cited
US1948671A
Cited
US2647994A
Cited
US2595608A
Cited
US2946884A
Cited
US2852669A
Cited
US2933598A
Cited
US2976410A
Cited
US2976411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |