US3293366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fm stereo multiplex receiver having stereophonic indicating means
Assignee: Motorola Solutions Inc
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Filing: 1965-03-18
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Granted: 1966-12-20
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Expires: 1985-03-18
Abstract
No abstract record available.
Inventors
- 👤 Leslie P Golonski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:14
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/22; H03D1/2209; H03D1/2218
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A MULTIPLEX STEREOPHONIC RECEIVER, INCLUDING IN COMBINATION, FIRST CIRCUIT MEANS RESPONSIVE TO RECEPTION OF FREQUENCY MODULATED SIGNALS TO DERIVE AUDIO FREQUENCY STEREOPHONIC AND MONOPHONIC SIGNALS, SECOND CIRCUIT MEANS PROVIDING SWITCHING SIGNALS IN RESPONSE TO RECEPTION OF STEREOPHONIC SIGNALS, THIRD CIRCUIT MEANS CONNECTED TO SAID FIRST AND SECOND CIRCUIT MEANS FOR PASSING MONOPHONIC SIGNALS SUBSTANTIALLY FREE OF DISTORTION AND FOR TRANSLATING THE STEREOPHONIC SIGNALS TO DEVELOP SEPARATED LEFT AND RIGHT STEREOPHONIC SIGNALS, SAID THIRD CIRCUIT MEANS INCLUDING RECTIFIER MEANS DEVELOPING A DIRECT CURRENT POTENTIAL IN RESPONSE TO THE SWITCHING SIGNALS APPLIED THERETO FROM SAID SECOND CIRCUIT MEANS, AND INDICATOR MEANS COUPLED TO SAID RECTIFIER MEANS AND RESPONSIVE TO THE DIRECT CURRENT POTENTIAL DEVELOPED THEREBY TO INDICATE THAT STEREOPHONIC SIGNALS ARE BEING RECEIVED BY SAID RECEIVER.
Claim 2
Dependent Claim
124 words
A MULTIPLEX STEREOPHONIC RECEIVER, INCLUDING IN COMBINATION, FIRST CIRCUIT MEANS RESPONSIVE TO RECEPTION OF FREQUENCY MODULATED SIGNALS TO DERIVE AUDIO FREQUENCY STEREOPHONIC AND MONOPHONIC SIGNALS, SECOND CIRCUIT MEANS PROVIDING SWITCHING SIGNALS IN RESPONSE TO RECEPTION OF STEREOPHONIC SIGNALS, THIRD CIRCUIT MEANS CONNECTED TO SAID FIRST AND SECOND CIRCUIT MEANS FOR PASSING MONOPHONIC SIGNALS SUBSTANTIALLY FREE OF DISTORTION AND FOR TRANSLATING THE STEREOPHONIC SIGNALS TO DEVELOP SEPARATED LEFT AND RIGHT STEREOPHONIC SIGNALS, SAID THIRD CIRCUIT MEANS INCLUDING RECTIFIER MEANS DEVELOPING A DIRECT CURRENT POTENTIAL IN RESPONSE TO THE SWITCHING SIGNALS APPLIED THERETO FROM SAID SECOND CIRCUIT MEANS, AND INDICATOR MEANS COUPLED TO SAID RECTIFIER MEANS AND RESPONSIVE TO THE DIRECT CURRENT POTENTIAL DEVELOPED THEREBY TO INDICATE THAT STEREOPHONIC SIGNALS ARE BEING RECEIVED BY SAID RECEIVER.
References Cited (Backward Citations)
US3225143A
Cited
US3116372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |