US3264414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereophonic fm receivers
Assignee: RCA Corp
•
Filing: 1963-05-28
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Granted: 1966-08-02
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Expires: 1983-05-28
Abstract
No abstract record available.
Inventors
- 👤 Santilli Richard
- 👤 Plus Lova
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:42
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/22; H03D1/2209; H03D1/2218
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A CIRCUIT FOR FREQUENCY-MODULATION STEREOPHONIC RECEIVERS COMPRISING: A CIRCUIT FOR CONNECTION TO A SOURCE OF DEMODULATED FREQUENCY-MODULATION SIGNALS WHICH DURING MONOPHONIC RECEPTION COMPRISE AUDIO-FREQUENCY SIGNALS AND WHICH DURING STEREOPHONIC SIGNAL RECEPTION INCLUDES: (1) AUDIO-FREQUENCY SIGNALS, (2) SUBCARRIER SIDEBAND SIGNALS, (3) A PILOT SIGNAL, MEANS FOR SEPARATING SAID PILOT SIGNAL FROM THE REMAINDER OF SAID COMPOSITE SIGNAL, A SIGNAL TRANSLATING STAGE HAVING AN INPUT CIRCUIT COUPLED TO RECEIVE SAID PILOT SIGNAL AND AN OUTPUT CIRCUIT FOR SAID PILOT SIGNAL, MEANS INCLUDING A DETECTOR CIRCUIT COUPLED TO SAID SIGNAL TRANSLATING STAGE FOR MAINTAINING SAID SIGNAL TRANSLATING STAGE CUTOFF DURING MONOPHONIC RECEPTION WHEN SAID PILOT SIGNAL IS ABSENT AND FOR CONDITIONING SAID SIGNAL TRANSLATING STAGE FOR OPERATION DURING STEREOPHONIC RECEPTION WHEN SAID PILOT SIGNAL IS PRESENT, AND MEANS COUPLING SAID DETECTOR CIRCUIT TO RECEIVE SAID PILOT SIGNAL FROM SAID SEPARATING MEANS AND FROM THE OUTPUT CIRCUIT OF SAID SIGNAL TRANSLATING MEANS.
Claim 2
Dependent Claim
148 words
A CIRCUIT FOR FREQUENCY-MODULATION STEREOPHONIC RECEIVERS COMPRISING: A CIRCUIT FOR CONNECTION TO A SOURCE OF DEMODULATED FREQUENCY-MODULATION SIGNALS WHICH DURING MONOPHONIC RECEPTION COMPRISE AUDIO-FREQUENCY SIGNALS AND WHICH DURING STEREOPHONIC SIGNAL RECEPTION INCLUDES: (1) AUDIO-FREQUENCY SIGNALS, (2) SUBCARRIER SIDEBAND SIGNALS, (3) A PILOT SIGNAL, MEANS FOR SEPARATING SAID PILOT SIGNAL FROM THE REMAINDER OF SAID COMPOSITE SIGNAL, A SIGNAL TRANSLATING STAGE HAVING AN INPUT CIRCUIT COUPLED TO RECEIVE SAID PILOT SIGNAL AND AN OUTPUT CIRCUIT FOR SAID PILOT SIGNAL, MEANS INCLUDING A DETECTOR CIRCUIT COUPLED TO SAID SIGNAL TRANSLATING STAGE FOR MAINTAINING SAID SIGNAL TRANSLATING STAGE CUTOFF DURING MONOPHONIC RECEPTION WHEN SAID PILOT SIGNAL IS ABSENT AND FOR CONDITIONING SAID SIGNAL TRANSLATING STAGE FOR OPERATION DURING STEREOPHONIC RECEPTION WHEN SAID PILOT SIGNAL IS PRESENT, AND MEANS COUPLING SAID DETECTOR CIRCUIT TO RECEIVE SAID PILOT SIGNAL FROM SAID SEPARATING MEANS AND FROM THE OUTPUT CIRCUIT OF SAID SIGNAL TRANSLATING MEANS.
References Cited (Backward Citations)
US3225143A
Cited
US3219760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |