US3278855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Afc system with a beat frequency drift cancellation oscillator
Assignee: Racal Communications Ltd
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Filing: 1965-05-03
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Granted: 1966-10-11
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Expires: 1985-05-03
Abstract
No abstract record available.
Inventors
- 👤 Maitland Peter
- 👤 Winn Roger Frederick Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:06
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/16; H03L7/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
A FREQUENCY SYNTHESISER FOR PROVIDING AN OSCILLATORY OUTPUT OF SELECTED FREQUENCY LYING WITHIN A PREDETERMINED RANGE, COMPRISING A FREQUENCY CONTROLLED OSCILLATOR HAVING FREQUENCY CONTROL MEANS, A SECOND OSCILLATOR A FIRST MIXER, A PART OF THE OUTPUT OF SAID FREQUENCYCONTROLLED OSCILLATOR AND A PART OF THE OUTPUT OF SAID SECOND OSCILLATOR BEING APPLIED TO SAID FIRST MIXER TO PROVIDE A LOWER SIDEBAND OUTPUT FROM SAID FIRST MIXER WHICH CONSTITUTES SAID OSCILLATORY OUTPUT OF SELECTED FREQUENCY, A SECOND MIXER, A FURTHER PART OF THE OUTPUT OF SAID FREQUENCY-CONTROLLED OSCILLATOR AND A FURTHER PART OF THE OUTPUT OF SAID SECOND OSCILLATOR BEING APPLIED TO SAID SECOND MIXER TO PROVIDE A LOWER SIDEBAND OUTPUT FROM SAID SECOND MIXER, A SOURCE OF OSCILLATIONS OF CONTROLLED FREQUENCY, AND A THIRD MIXER, A LOWER SIDEBAND OF THE OUTPUT FROM SAID SECOND MIXER AND OSCILLATIONS FROM SAID SOURCE OF OSCILLATIONS BEING APPLIED TO SAID THIRD MIXER, AN OUTPUT FROM SAID THIRD MIXER BEING APPLIED TO SAID FREQUENCY CONTROL MEANS TO CONTROL THE FREQUENCY OF SAID FREQUENCY-CONTROLLED OSCILLATOR.
Claim 2
Dependent Claim
169 words
A FREQUENCY SYNTHESISER FOR PROVIDING AN OSCILLATORY OUTPUT OF SELECTED FREQUENCY LYING WITHIN A PREDETERMINED RANGE, COMPRISING A FREQUENCY CONTROLLED OSCILLATOR HAVING FREQUENCY CONTROL MEANS, A SECOND OSCILLATOR A FIRST MIXER, A PART OF THE OUTPUT OF SAID FREQUENCYCONTROLLED OSCILLATOR AND A PART OF THE OUTPUT OF SAID SECOND OSCILLATOR BEING APPLIED TO SAID FIRST MIXER TO PROVIDE A LOWER SIDEBAND OUTPUT FROM SAID FIRST MIXER WHICH CONSTITUTES SAID OSCILLATORY OUTPUT OF SELECTED FREQUENCY, A SECOND MIXER, A FURTHER PART OF THE OUTPUT OF SAID FREQUENCY-CONTROLLED OSCILLATOR AND A FURTHER PART OF THE OUTPUT OF SAID SECOND OSCILLATOR BEING APPLIED TO SAID SECOND MIXER TO PROVIDE A LOWER SIDEBAND OUTPUT FROM SAID SECOND MIXER, A SOURCE OF OSCILLATIONS OF CONTROLLED FREQUENCY, AND A THIRD MIXER, A LOWER SIDEBAND OF THE OUTPUT FROM SAID SECOND MIXER AND OSCILLATIONS FROM SAID SOURCE OF OSCILLATIONS BEING APPLIED TO SAID THIRD MIXER, AN OUTPUT FROM SAID THIRD MIXER BEING APPLIED TO SAID FREQUENCY CONTROL MEANS TO CONTROL THE FREQUENCY OF SAID FREQUENCY-CONTROLLED OSCILLATOR.
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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |