Patent US3090918A successfully refreshed from Google Patents.
US3090918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fm-am receiver
Assignee: MCINTOSH LAB Inc
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Filing: 1958-10-09
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Granted: 1963-05-21
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Expires: 1978-10-09
Abstract
No abstract record available.
Inventors
- 👤 Lawrence B Arguimbau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:56
CPC Classifications
H; H03; H03D; H03D5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
A SQUELCH CIRCUIT FOR AN FM SUPERHETERODYNE RECEIVER UNRESPONSIVE TO MULTIPLEX CHANNEL SIGNALS, COMPRISING A MIXER, MEANS FOR APPLYING AN FM CARRIER TO SAID MIXER, A LOCAL OSCILLATOR, MEANS FOR COUPLING SAID LOCAL OSCILLATOR TO SAID MIXER, AN I.F. AMPLIFIER COUPLED IN CASCADE TO SAID MIXIER FOR DERIVING I.F. SIGNAL FROM SAID MIXER, SAID I.F. AMPLIFIER HAVING A PREDETERMINED BANDWIDTH, A LIMITER COUPLED IN CASCADE TO SAID I.F. AMPLIFIER, SAID LIMITER HAVING A BANDWIDTH GREATLY IN EXCESS OF SAID PREDETERMINED BANDWIDTH, A FREQUENCY DETECTOR COUPLED IN CASCADE WITH SAID LIMITER, SAID FREQUENCY DETECTOR HAVING A BANDWIDTH GREATLY IN EXCESS OF SAID PREDETERMINED BANDWIDTH, A HIGH PASS FILTER COUPLED IN CASCADE TO SAID FREQUENCY DETECTOR, SAID HIGH PASS FILTER DESIGNED TO PASS FREQUENCIES HIGHER THAN ONE-HALF SAID PREDETERMINED BANDWIDTH BUT WITHIN THE PASS BAND OF SAID LIMITER AND OF SAID FREQUENCY DETECTOR, MEANS FOR DETECTING THE OUTPUT OF SAID FILTER TO DERIVE A CONTROL SIGNAL, AN AUDIO AMPLIFIER
Claim 2
Dependent Claim
157 words
A SQUELCH CIRCUIT FOR AN FM SUPERHETERODYNE RECEIVER UNRESPONSIVE TO MULTIPLEX CHANNEL SIGNALS, COMPRISING A MIXER, MEANS FOR APPLYING AN FM CARRIER TO SAID MIXER, A LOCAL OSCILLATOR, MEANS FOR COUPLING SAID LOCAL OSCILLATOR TO SAID MIXER, AN I.F. AMPLIFIER COUPLED IN CASCADE TO SAID MIXIER FOR DERIVING I.F. SIGNAL FROM SAID MIXER, SAID I.F. AMPLIFIER HAVING A PREDETERMINED BANDWIDTH, A LIMITER COUPLED IN CASCADE TO SAID I.F. AMPLIFIER, SAID LIMITER HAVING A BANDWIDTH GREATLY IN EXCESS OF SAID PREDETERMINED BANDWIDTH, A FREQUENCY DETECTOR COUPLED IN CASCADE WITH SAID LIMITER, SAID FREQUENCY DETECTOR HAVING A BANDWIDTH GREATLY IN EXCESS OF SAID PREDETERMINED BANDWIDTH, A HIGH PASS FILTER COUPLED IN CASCADE TO SAID FREQUENCY DETECTOR, SAID HIGH PASS FILTER DESIGNED TO PASS FREQUENCIES HIGHER THAN ONE-HALF SAID PREDETERMINED BANDWIDTH BUT WITHIN THE PASS BAND OF SAID LIMITER AND OF SAID FREQUENCY DETECTOR, MEANS FOR DETECTING THE OUTPUT OF SAID FILTER TO DERIVE A CONTROL SIGNAL, AN AUDIO AMPLIFIER
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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) | 1966-05-20 | 1966-11-19 | 1967-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-20 | 1970-11-19 | 1971-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-20 | 1974-11-19 | 1975-05-21 | $7700.00 | Window Closed / Lapsed |