Patent US3089920A successfully refreshed from Google Patents.
US3089920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carrier telephone systems
Assignee: Post Office
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Filing: 1959-01-26
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Granted: 1963-05-14
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Expires: 1979-01-26
Abstract
No abstract record available.
Inventors
- 👤 Law Harry Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:37
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/18; H04J1/02; H04J1/04; H04J1/045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A TRANSMISSION SYSTEM COMPRISING, IN COMBINATION A PLURALITY OF COMMUNICATION CHANNELS, EACH INCLUDING: (A) MEANS FOR MODULATING AN INFORMATION SIGNAL FED INTO A CHANNEL FOR GENERATING A SINGLE SIDE BAND, (B) TWO CARRIER SIGNAL SOURCE MEANS EACH CONNECTED TO A MODULATING MEANS, SAID TWO CARRIER SIGNAL SOURCE MEANS HAVING A DIFFERENCE IN FREQUENCY WHICH PROVIDES A FREQUENCY GAP BETWEEN THE MODULATED SIDE BANDS OF DIFFERENT CHANNELS WHICH IS LESS THAN THE LOWEST INFORMATION SIGNAL FREQUENCY TO BE TRANSMITTED IN ANY CHANNEL AND WITH THE CARRIER SIGNAL FREQUENCY OF ONE CHANNEL BEING WITHIN THE MODULATED SINGLE SIDE BAND OF ANOTHER CHANNEL; AND (C) MEANS FOR PREVENTING, IN EACH CHANNEL, FURTHER TRANSMISSION OF THE CARRIER FREQUENCY SIGNAL OF THIS CHANNEL.
Claim 2
Dependent Claim
118 words
A TRANSMISSION SYSTEM COMPRISING, IN COMBINATION A PLURALITY OF COMMUNICATION CHANNELS, EACH INCLUDING: (A) MEANS FOR MODULATING AN INFORMATION SIGNAL FED INTO A CHANNEL FOR GENERATING A SINGLE SIDE BAND, (B) TWO CARRIER SIGNAL SOURCE MEANS EACH CONNECTED TO A MODULATING MEANS, SAID TWO CARRIER SIGNAL SOURCE MEANS HAVING A DIFFERENCE IN FREQUENCY WHICH PROVIDES A FREQUENCY GAP BETWEEN THE MODULATED SIDE BANDS OF DIFFERENT CHANNELS WHICH IS LESS THAN THE LOWEST INFORMATION SIGNAL FREQUENCY TO BE TRANSMITTED IN ANY CHANNEL AND WITH THE CARRIER SIGNAL FREQUENCY OF ONE CHANNEL BEING WITHIN THE MODULATED SINGLE SIDE BAND OF ANOTHER CHANNEL; AND (C) MEANS FOR PREVENTING, IN EACH CHANNEL, FURTHER TRANSMISSION OF THE CARRIER FREQUENCY SIGNAL OF THIS CHANNEL.
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) | 1966-05-13 | 1966-11-12 | 1967-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-13 | 1970-11-12 | 1971-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-13 | 1974-11-12 | 1975-05-14 | $7700.00 | Window Closed / Lapsed |