Patent US3221271A successfully refreshed from Google Patents.
US3221271A
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Circuit for keeping constant the central frequency of a frequency-modulated oscillator
Assignee: Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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Filing: 1962-06-15
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Granted: 1965-11-30
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Expires: 1982-06-15
Abstract
No abstract record available.
Inventors
- 👤 Waard Pieter De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:38
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/02; H03C3/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A DEVICE COMPRISING AN OSCILLATOR, A MODULATOR, MEANS CONNECTING THE OUTPUT OF THE MODULATOR TO THE INPUT OF SAID OSCILLATOR, A FREQUENCY DETECTOR WITH AN ELECTRO-MECHANICAL ELEMENT, WHICH DETECTOR IS COUPLED BETWEEN THE OUTPUT OF SAID OSCILLATOR AND THE INPUT OF SAID MODULATOR, THE FREQUENCY DETECTION CURVE OF SAID DETECTOR BEING MAINLY DETERMINED BY THE PROPERTIES OF THE ELEMENT, AND THE MODULATING WAVE BEING FED TO SAID MODULATOR BY MEANS OF A FILTER WHICH INFLUENCES THE MODULATION-INDEX, SO THAT THE SLOPE OF SAID DETECTION CURVE DOES NOT CHANGE ITS SIGN MORE THAN TWICE.
Claim 2
Independent Claim
93 words
A DEVICE COMPRISING AN OSCILLATOR, A MODULATOR, MEANS CONNECTING THE OUTPUT OF THE MODULATOR TO THE INPUT OF SAID OSCILLATOR, A FREQUENCY DETECTOR WITH AN ELECTRO-MECHANICAL ELEMENT, WHICH DETECTOR IS COUPLED BETWEEN THE OUTPUT OF SAID OSCILLATOR AND THE INPUT OF SAID MODULATOR, THE FREQUENCY DETECTION CURVE OF SAID DETECTOR BEING MAINLY DETERMINED BY THE PROPERTIES OF THE ELEMENT, AND THE MODULATING WAVE BEING FED TO SAID MODULATOR BY MEANS OF A FILTER WHICH INFLUENCES THE MODULATION-INDEX, SO THAT THE SLOPE OF SAID DETECTION CURVE DOES NOT CHANGE ITS SIGN MORE THAN TWICE.
References Cited (Backward Citations)
US2501368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |