US3275938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency modulation circuit
Assignee: Motorola Solutions Inc
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Filing: 1963-01-07
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Granted: 1966-09-27
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Expires: 1983-01-07
Abstract
No abstract record available.
Inventors
- 👤 Richard D Carsello
- 👤 David L Gunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:07
CPC Classifications
H; H03; H03D; H03D3/00; H03D3/02; H03D3/06; H03D3/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A FREQUENCY MODULATION DETECTOR CIRCUIT FOR DERIVING THE MODULATION SIGNAL FROM A FREQUENCY MODULATED CARRIER WAVE HAVING A PREDETERMINED CENTER FREQUENCY, SAID CIRCUIT INCLUDING IN COMBINATION, A TRANSISTOR HAVING A CONTROL ELECTRODE AND OUTPUT ELECTRODE FOR APPLYING THE MEANS CONNECTED TO SAID CONTROL ELECTRODE FOR APPLYING THE MODULATED WAVE THERETO, AND A SERIES CIRCUIT INCLUDING A PARALLEL RESONANT CIRCUIT AND RECTIFIER MEANS CONNECTING SAID RESONANT CIRCUIT TO SAID OUTPUT ELECTRODES, SAID SERIES CIRCUIT FURTHER INCLUDING IMPEDANCE MEANS SAID PARALLEL RESONANT CIRCUIT BEING TUNED TO A FREQUENCY ABOVE THE PREDETERMINED CENTER FREQUENCY OF THE MODULATED WAVE TO BE DETECTED, SAID RECTIFIER MEANS BEING POLED TO CONDUCT CURRENT IN THE SERIES CIRCUIT OF THE SAME POLARITY WHICH IS CONDUCTED BY SAID OUTPUT ELECTRODES TO PROVIDE CURRENT FLOW THROUGH SAID IMPEDANCE MEANS, AND OUTPUT CIRCUIT MEANS CONNECTED TO SAID IMPEDANCE MEANS FOR DERIVING THE MODULATION SIGNAL.
Claim 2
Dependent Claim
143 words
A FREQUENCY MODULATION DETECTOR CIRCUIT FOR DERIVING THE MODULATION SIGNAL FROM A FREQUENCY MODULATED CARRIER WAVE HAVING A PREDETERMINED CENTER FREQUENCY, SAID CIRCUIT INCLUDING IN COMBINATION, A TRANSISTOR HAVING A CONTROL ELECTRODE AND OUTPUT ELECTRODE FOR APPLYING THE MEANS CONNECTED TO SAID CONTROL ELECTRODE FOR APPLYING THE MODULATED WAVE THERETO, AND A SERIES CIRCUIT INCLUDING A PARALLEL RESONANT CIRCUIT AND RECTIFIER MEANS CONNECTING SAID RESONANT CIRCUIT TO SAID OUTPUT ELECTRODES, SAID SERIES CIRCUIT FURTHER INCLUDING IMPEDANCE MEANS SAID PARALLEL RESONANT CIRCUIT BEING TUNED TO A FREQUENCY ABOVE THE PREDETERMINED CENTER FREQUENCY OF THE MODULATED WAVE TO BE DETECTED, SAID RECTIFIER MEANS BEING POLED TO CONDUCT CURRENT IN THE SERIES CIRCUIT OF THE SAME POLARITY WHICH IS CONDUCTED BY SAID OUTPUT ELECTRODES TO PROVIDE CURRENT FLOW THROUGH SAID IMPEDANCE MEANS, AND OUTPUT CIRCUIT MEANS CONNECTED TO SAID IMPEDANCE MEANS FOR DERIVING THE MODULATION SIGNAL.
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) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |