US3202765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronization of frequency multiplex systems
Assignee: AT&T Inc
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Filing: 1961-08-23
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Granted: 1965-08-24
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Expires: 1981-08-23
Abstract
No abstract record available.
Inventors
- 👤 Charles J Byrne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:34
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/04; H04J1/06; H04J1/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A SUPPRESSED-CARRIER FREQUENCY MULTIPLEX SYSTEM COMPRISING MEANS FOR GENERATING A PLURALITY OF SUPPRESSEDCARRIER FREQUENCY-DISPLACED MESSSAGE-BEARING SIGNALS, A SOURCE OF A SYNCHRONIZING SIGNAL OF FREQUENCY FS, A SOURCE OF A PILOT SIGAL OF FREQUENCY FP, MEANS FOR MODULATING SAID PILOT SIGNAL OF FREQUENCY FP, MEAN FOR MODULATING A MODULATED PILOT SIGNAL HAVING COMPONENTS OF FREQUENCIES FP, FP+FS AND FP-FS, A REMOTE RECEIVER STATION, AND MEANS FOR TRANSMITTING SAID SUPPRESSED-CARRIER SIGNALS, ALONG WITH SAID MODULATED PILOT SIGNAL, TO SAID RECEIVER STATION OVER A TRANSMISSION MEDIUM LIKELY TO IMPART AN UNPREDICTABLE FREQUENCY SHIFT $ TO THE TRANSMITTED SIGNALS.
Claim 2
Dependent Claim
95 words
A SUPPRESSED-CARRIER FREQUENCY MULTIPLEX SYSTEM COMPRISING MEANS FOR GENERATING A PLURALITY OF SUPPRESSEDCARRIER FREQUENCY-DISPLACED MESSSAGE-BEARING SIGNALS, A SOURCE OF A SYNCHRONIZING SIGNAL OF FREQUENCY FS, A SOURCE OF A PILOT SIGAL OF FREQUENCY FP, MEANS FOR MODULATING SAID PILOT SIGNAL OF FREQUENCY FP, MEAN FOR MODULATING A MODULATED PILOT SIGNAL HAVING COMPONENTS OF FREQUENCIES FP, FP+FS AND FP-FS, A REMOTE RECEIVER STATION, AND MEANS FOR TRANSMITTING SAID SUPPRESSED-CARRIER SIGNALS, ALONG WITH SAID MODULATED PILOT SIGNAL, TO SAID RECEIVER STATION OVER A TRANSMISSION MEDIUM LIKELY TO IMPART AN UNPREDICTABLE FREQUENCY SHIFT $ TO THE TRANSMITTED 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) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |