US3301959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fm stereo high level demodulating system
Assignee: RCA Corp
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Filing: 1964-01-15
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Granted: 1967-01-31
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Expires: 1984-01-15
Abstract
No abstract record available.
Inventors
- 👤 Jenkins Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:37
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/22; H03D1/2209; H03D1/2218
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A FREQUENCY MODULATED STEREOPHONIC RECEIVER COMPRISING: CIRCUIT MEANS FOR DEMODULATING A RECEIVED COMPOSITE STEREOPHONIC FREQUENCY MODULATED SIGNAL TO RECOVER ITS MODULATION COMPONENTS, A SINGLE AUDIO FREQUENCY AMPLIFIER CHANNEL INCLUDING A WIDE BAND AUDIO POWER AMPLIFIER COUPLED TO SAID CIRCUIT MEANS TO RECEIVE SAID RECOVERED COMPONENTS, A TUNED POWER AMPLIFIER TUNED TO A PREDETERMINED FREQUENCY COUPLED TO SAID CIRCUIT MEANS, A HIGH LEVEL DEMODULATOR CIRCUIT COUPLED TO SAID AUDIO POWER AMPLIFIER AND TO SAID TUNED POWER AMPLIFIER FOR PROVIDING AT RESPECTIVE FIRST AND SECOND OUTPUT TERMINALS FIRST AND SECOND HIGH LEVEL STEREOPHONICALLY RELATED AUDIO OUTPUT SIGNALS, THE LEVEL OF SAID OUTPUT SIGNALS BEING SUFFICIENT TO DRIVE DIRECTLY AUDIO REPRODUCING LOUDSPEAKERS, FIRST AND SECOND LOUDSPEAKERS DIRECTLY CONNECTED RESPECTIVELY TO SAID FIRST AND SECOND OUTPUT TERMINALS, AND NEGATIVE FEEDBACK MEANS COUPLED TO SAID FIRST AND SECOND OUTPUT TERMINALS FOR DEVELOPING A FEEDBACK SIGNAL PROPORTIONAL TO THE SUM OF SAID STEREOPHONICALLY RELATED SIGNALS AND FOR APPLYING SAID FEEDBACK SIGNAL TO SAID AUDIO POWER AMPLIFIER.
Claim 2
Dependent Claim
160 words
A FREQUENCY MODULATED STEREOPHONIC RECEIVER COMPRISING: CIRCUIT MEANS FOR DEMODULATING A RECEIVED COMPOSITE STEREOPHONIC FREQUENCY MODULATED SIGNAL TO RECOVER ITS MODULATION COMPONENTS, A SINGLE AUDIO FREQUENCY AMPLIFIER CHANNEL INCLUDING A WIDE BAND AUDIO POWER AMPLIFIER COUPLED TO SAID CIRCUIT MEANS TO RECEIVE SAID RECOVERED COMPONENTS, A TUNED POWER AMPLIFIER TUNED TO A PREDETERMINED FREQUENCY COUPLED TO SAID CIRCUIT MEANS, A HIGH LEVEL DEMODULATOR CIRCUIT COUPLED TO SAID AUDIO POWER AMPLIFIER AND TO SAID TUNED POWER AMPLIFIER FOR PROVIDING AT RESPECTIVE FIRST AND SECOND OUTPUT TERMINALS FIRST AND SECOND HIGH LEVEL STEREOPHONICALLY RELATED AUDIO OUTPUT SIGNALS, THE LEVEL OF SAID OUTPUT SIGNALS BEING SUFFICIENT TO DRIVE DIRECTLY AUDIO REPRODUCING LOUDSPEAKERS, FIRST AND SECOND LOUDSPEAKERS DIRECTLY CONNECTED RESPECTIVELY TO SAID FIRST AND SECOND OUTPUT TERMINALS, AND NEGATIVE FEEDBACK MEANS COUPLED TO SAID FIRST AND SECOND OUTPUT TERMINALS FOR DEVELOPING A FEEDBACK SIGNAL PROPORTIONAL TO THE SUM OF SAID STEREOPHONICALLY RELATED SIGNALS AND FOR APPLYING SAID FEEDBACK SIGNAL TO SAID AUDIO POWER AMPLIFIER.
References Cited (Backward Citations)
US3070662A
Cited
US3167615A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |