US3102167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase-shifted double-sideband two-channel a.m. communications system
Assignee: RCA Corp
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Filing: 1959-04-27
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Granted: 1963-08-27
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Expires: 1979-04-27
Abstract
No abstract record available.
Inventors
- 👤 Loy E Barton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:13
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/86; H04H20/88
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
117 words
A SIGNAL COMMUNICATIONS SYSTEM FOR TWO-CHANNEL STEREOPHONIC AMPLITUDE-MODULATED SIGNAL TRANSMISSION AND RECEPTION AND COMPATIBLE FOR MONOPHONIC SIGNAL RECEPTION COMPRISING, MEANS FOR GENERATING AND TRANSMITTING A COMPOSITE TWO-CHANNEL AMPLITUDE-MODULATED CARRIER SIGNAL WITH A FIRST SET OF UPPER AND LOWER SIDEBANDS SHIFTED PLUS 25* TO 30* THEREFROM FOR ONE MODULATION CHANNEL AND WITH A SECOND SET OF UPPER AND LOWER SIDEBANDS SHIFTED THEREFROM MINUS 25* TO 30* FOR THE OTHER MODULATION CHANNEL, THE TOTAL ANGLE BETWEEN CHANNEL SIDEBANDS BEING SUBSTANTIALLY 50* TO 60*, AND MEANS FOR RECEIVING AND DECODING FROM SAID SIGNAL TWO SEPARATE MODULATION COMPONENTS INCLUDING A SIGNAL-FREQUENCY PHASE-LOCKED EXALTED-CARRIER OSCILLATOR AND AN AUTOMATICFREQUENCY-CONTROL CIRCUIT THEREFOR RESPONSIVE TO THE PHASE DIFFERENTIAL OF THE RECEIVED-CARRIER AND THE EXALTED-CARRIER SIGNALS.
References Cited (Backward Citations)
US1608566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-26 | 1967-02-25 | 1967-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-26 | 1971-02-25 | 1971-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-26 | 1975-02-25 | 1975-08-27 | $7700.00 | Window Closed / Lapsed |