US3294913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency division multiplex system for sideband transmission
Assignee: Associated Electrical Industries Ltd
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Filing: 1963-03-19
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Granted: 1966-12-27
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Expires: 1983-03-19
Abstract
No abstract record available.
Inventors
- 👤 Saraga Wolja
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:06
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
FOR A FREQUENCY DIVISION MULITPLEX SYSTEM HAVING AT LEAST TWO CARRIER CHANNELS TO WHICH RESPECTIVE CARRIER FREQUENCIES ARE ALLOCATED, A MODULATION CIRCUIT ARRANGEMENT COMPRISING FIRST COMBINING MEANS FOR COMBINING THE CARRIER OF ONE CHANNEL AND AN ALTERNATING CURRENT SIGNAL TO BE TRANSMITTED IN A SECOND CHANNEL, SECOND COMBINING MEANS FOR COMBINING THE CARRIER OF THIS SECOND CHANNEL AND AN ALTERNATING CURRENT SIGNAL TO BE TRANSMITTED IN THE FIRST CHANNEL, AND MEANS FOR MULTIPLYING TOGETHER THE RESULTANT COMBINATION SIGNALS FROMS SAID FIRST AND SECOND COMBINING MEANS TO PROVIDE AN OUTPUT CONTAINING UPPER AND LOWER SIDEBANDS CORRESPONDING TO THE MODULATION PRODUCT OF THE CARRIER AND THE ALTERNATING CURRENT SIGNAL OF THE SAID ONE CHANNEL AND UPPER AND LOWER SIDEBANDS CORRESPONDING TO THE MODULATION PRODUCT OF THE CARRIER AND THE ALTERNATING CURRENT SIGNAL OF THE SAID SECOND CHANNEL.
Claim 2
Dependent Claim
135 words
FOR A FREQUENCY DIVISION MULITPLEX SYSTEM HAVING AT LEAST TWO CARRIER CHANNELS TO WHICH RESPECTIVE CARRIER FREQUENCIES ARE ALLOCATED, A MODULATION CIRCUIT ARRANGEMENT COMPRISING FIRST COMBINING MEANS FOR COMBINING THE CARRIER OF ONE CHANNEL AND AN ALTERNATING CURRENT SIGNAL TO BE TRANSMITTED IN A SECOND CHANNEL, SECOND COMBINING MEANS FOR COMBINING THE CARRIER OF THIS SECOND CHANNEL AND AN ALTERNATING CURRENT SIGNAL TO BE TRANSMITTED IN THE FIRST CHANNEL, AND MEANS FOR MULTIPLYING TOGETHER THE RESULTANT COMBINATION SIGNALS FROMS SAID FIRST AND SECOND COMBINING MEANS TO PROVIDE AN OUTPUT CONTAINING UPPER AND LOWER SIDEBANDS CORRESPONDING TO THE MODULATION PRODUCT OF THE CARRIER AND THE ALTERNATING CURRENT SIGNAL OF THE SAID ONE CHANNEL AND UPPER AND LOWER SIDEBANDS CORRESPONDING TO THE MODULATION PRODUCT OF THE CARRIER AND THE ALTERNATING CURRENT SIGNAL OF THE SAID SECOND CHANNEL.
References Cited (Backward Citations)
US3010069A
Cited
US2855462A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |