US3238460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency modulation receiver with frequency restricted feedback
Assignee: AT&T Inc
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Filing: 1961-04-25
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Granted: 1966-03-01
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Expires: 1981-04-25
Abstract
No abstract record available.
Inventors
- 👤 Louis H Enloe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:14
CPC Classifications
H; H04; H04J; H04J9/00; H03; H03D; H03D3/00; H03D3/001; H03D3/003; H03D3/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
IN A DEMODULATOR FOR FREQUENCY MODULATION SIGNALS, A LOOP CIRCUIT INCLUDING IN THE ORDER NAMED A MIXER, FREQUENCY DETECTOR AND A SOURCE OF OSCILLATIONS OF CONTROLLABLE FREQUENCY, MEANS INCLUDING A FIRST FILTER CONNECTED IN THE PATH BETWEEN SAID MIXER AND SAID DETECTOR AND HAVING THE TRANSMISSION CHARACTERISTIC OF A SINGLE-TUNED CIRCUIT AND ADDITIONAL ELEMENTS CONNECTED IN THE PATH BETWEEN SAID DETECTOR AND SAID SOURCE OF OSCILLATIONS FOR LIMITING THE PRODUCTION OF SIDEBANDS UPON MODULATION OF SAID
Claim 2
Dependent Claim
76 words
IN A DEMODULATOR FOR FREQUENCY MODULATION SIGNALS, A LOOP CIRCUIT INCLUDING IN THE ORDER NAMED A MIXER, FREQUENCY DETECTOR AND A SOURCE OF OSCILLATIONS OF CONTROLLABLE FREQUENCY, MEANS INCLUDING A FIRST FILTER CONNECTED IN THE PATH BETWEEN SAID MIXER AND SAID DETECTOR AND HAVING THE TRANSMISSION CHARACTERISTIC OF A SINGLE-TUNED CIRCUIT AND ADDITIONAL ELEMENTS CONNECTED IN THE PATH BETWEEN SAID DETECTOR AND SAID SOURCE OF OSCILLATIONS FOR LIMITING THE PRODUCTION OF SIDEBANDS UPON MODULATION OF SAID
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |