Patent US3143600A successfully refreshed from Google Patents.
US3143600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A. m. stereo system
Assignee: Zenith Electronics LLC
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Filing: 1962-02-15
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Granted: 1964-08-04
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Expires: 1982-02-15
Abstract
No abstract record available.
Inventors
- 👤 Vries Adrian J De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:25
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/86; H04H20/88; Y; Y10; Y10S; Y10S206/00; Y10S206/812
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
IN A STEREOPHONIC BROADCASTING SYSTEM FOR UTILIZING A CARRIER SIGNAL HAVING AMPLITUDE MODULATION AND ANGULARVELOCITY MODULATION OF WHICH ONE FORM OF MODULATION REPRESENTS THE SUM AND THE OTHER REPRESENTS THE DIFFERENCE OF A PAIR OF AUDIO PROGRAM SIGNALS, A RECEIVER COMPRISING: MEANS FOR SELECTING SAID CARRIER SIGNAL; MEANS INCLUDING A DETECTOR FOR DEMODULATING SAID AMPLITUDE MODULATION AND FURTHER INCLUDING A DISCRIMINATOR FOR CONVERTING SAID ANGULAR-VELOCITY MODULATION INTO AMPLITUDE MODULATION FOR DEMODULATION BY SAID DETECTOR; MEANS FOR EFFECTIVELY MODIFYING THE PERCENTAGE OF MODULATION OF AT LEAST ONE OF SAID FORMS OF MODULATION ON SAID CARRIER TO OBTAIN EQUAL RESPONSE IN SAID DEMODULATING MEANS TO BOTH OF SAID FORMS OF MODULATION ON SAID CARRIER; AND MEANS FOR DERIVING AN OUTPUT SIGNAL FROM SAID DEMODULATING MEANS CORRESPONDING PREDOMINANTLY TO ONE OF SAID AUDIO PROGRAM SIGNALS.
Claim 2
Dependent Claim
132 words
IN A STEREOPHONIC BROADCASTING SYSTEM FOR UTILIZING A CARRIER SIGNAL HAVING AMPLITUDE MODULATION AND ANGULARVELOCITY MODULATION OF WHICH ONE FORM OF MODULATION REPRESENTS THE SUM AND THE OTHER REPRESENTS THE DIFFERENCE OF A PAIR OF AUDIO PROGRAM SIGNALS, A RECEIVER COMPRISING: MEANS FOR SELECTING SAID CARRIER SIGNAL; MEANS INCLUDING A DETECTOR FOR DEMODULATING SAID AMPLITUDE MODULATION AND FURTHER INCLUDING A DISCRIMINATOR FOR CONVERTING SAID ANGULAR-VELOCITY MODULATION INTO AMPLITUDE MODULATION FOR DEMODULATION BY SAID DETECTOR; MEANS FOR EFFECTIVELY MODIFYING THE PERCENTAGE OF MODULATION OF AT LEAST ONE OF SAID FORMS OF MODULATION ON SAID CARRIER TO OBTAIN EQUAL RESPONSE IN SAID DEMODULATING MEANS TO BOTH OF SAID FORMS OF MODULATION ON SAID CARRIER; AND MEANS FOR DERIVING AN OUTPUT SIGNAL FROM SAID DEMODULATING MEANS CORRESPONDING PREDOMINANTLY TO ONE OF SAID AUDIO PROGRAM SIGNALS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |