US3233043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time-division multiplex telephone switching system
Assignee: NEC Corp
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Filing: 1962-02-07
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Granted: 1966-02-01
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Expires: 1982-02-07
Abstract
No abstract record available.
Inventors
- 👤 Shimasaki Nobuhiko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:07
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
270 words
A TIME-DIVISION MULTIPLEX SWITCHING SYSTEM COMPRISING A PAIR OF TIME-DIVISION SUBSCRIBER CIRCUITS, EACH OF SAID CIRCUITS HAVING A FIRST PAIR OF CONDUCTORS CONNECTED TO A DIFFERENT TRANSDUCER, EACH OF SAID CIRCUITS ALSO HAVING A SECOND PAIR OF CONDUCTORS, SAID SUBSCRIBER CIRCUITS EACH INCLUDING BUFFER MEANS COUPLED TO SAID FIRST PAIR OF CONDUCTORS, SAID SUBSCRIBER CIRCUITS EACH FURTHER INCLUDING A PAIR OF TIME-DIVISION SWITCHES CONNECTED TO SAID BUFFER, ONE OF SAID TIME-DIVISION SWITCHES ALSO BEING CONNECTED TO ONE OF SAID SECOND PAIR OF CONDUCTORS AND THE OTHER OF SAME TIME-DIVISION SWITCHES BEING CONNECTED TO THE OTHER OF SAID SECOND PAIR, A PAIR OF HIGHWAYS, ONE OF SAID HIGHWAYS BEING CONNECTED TO ONE OF SAID SECOND PAIR OF CONDUCTORS AND THE OTHER OF SAID HIGHWAYS BEING CONNECTED TO HE OTHER OF SAID SECOND PAIR, A FIRST AMPLIFIER AND A SECOND AMPLIFIER, EACH OF SAID AMPLIFIER HAVING ITS INPUT CONNECTED TO A DIFFERENT ONE OF SAID HIGHWAYS THROUGH A DIFFERENT FIRST GATING MEANS AND ITS OUTPUT CONNECTED TO THE SAME HIGHWAY THROUGH A DIFFERENT SECOND GATING MEANS, FIRST SIGNAL STORAGE MEANS CONNECTED BETWEEN THE INPUT OF ONE AMPLIFIER AND A TERMINAL OF POSITIVE POTENTIAL, SECOND SIGNAL STORAGE MEANS CONNECTED BETWEEN THE INPUT OF THE OTHER AMPLIFIER AND A TERMINAL OF NEGATIVE POTENTIAL, AND MEANS FOR ACTUATING ONE OF SAID TIME-DIVISION SWITCHES IN EACH OF SAID SUBSCRIBER CIRCUITS AND BOTH OF SAID FIRST GATING MEANS DURING ONE HALF OF A GIVEN TIME SLOT, AND FOR ACTUATING THE OTHER OF SAID TIME-DIVISION SWITCHES IN EACH OF SAID SUBSCRIBER CIRCUITS AND BOTH OF SAID SECOND GATING MEANS DURING THE OTHER HALF OF SAID GIVEN TIME SLOT.
Claim 2
Dependent Claim
270 words
A TIME-DIVISION MULTIPLEX SWITCHING SYSTEM COMPRISING A PAIR OF TIME-DIVISION SUBSCRIBER CIRCUITS, EACH OF SAID CIRCUITS HAVING A FIRST PAIR OF CONDUCTORS CONNECTED TO A DIFFERENT TRANSDUCER, EACH OF SAID CIRCUITS ALSO HAVING A SECOND PAIR OF CONDUCTORS, SAID SUBSCRIBER CIRCUITS EACH INCLUDING BUFFER MEANS COUPLED TO SAID FIRST PAIR OF CONDUCTORS, SAID SUBSCRIBER CIRCUITS EACH FURTHER INCLUDING A PAIR OF TIME-DIVISION SWITCHES CONNECTED TO SAID BUFFER, ONE OF SAID TIME-DIVISION SWITCHES ALSO BEING CONNECTED TO ONE OF SAID SECOND PAIR OF CONDUCTORS AND THE OTHER OF SAME TIME-DIVISION SWITCHES BEING CONNECTED TO THE OTHER OF SAID SECOND PAIR, A PAIR OF HIGHWAYS, ONE OF SAID HIGHWAYS BEING CONNECTED TO ONE OF SAID SECOND PAIR OF CONDUCTORS AND THE OTHER OF SAID HIGHWAYS BEING CONNECTED TO HE OTHER OF SAID SECOND PAIR, A FIRST AMPLIFIER AND A SECOND AMPLIFIER, EACH OF SAID AMPLIFIER HAVING ITS INPUT CONNECTED TO A DIFFERENT ONE OF SAID HIGHWAYS THROUGH A DIFFERENT FIRST GATING MEANS AND ITS OUTPUT CONNECTED TO THE SAME HIGHWAY THROUGH A DIFFERENT SECOND GATING MEANS, FIRST SIGNAL STORAGE MEANS CONNECTED BETWEEN THE INPUT OF ONE AMPLIFIER AND A TERMINAL OF POSITIVE POTENTIAL, SECOND SIGNAL STORAGE MEANS CONNECTED BETWEEN THE INPUT OF THE OTHER AMPLIFIER AND A TERMINAL OF NEGATIVE POTENTIAL, AND MEANS FOR ACTUATING ONE OF SAID TIME-DIVISION SWITCHES IN EACH OF SAID SUBSCRIBER CIRCUITS AND BOTH OF SAID FIRST GATING MEANS DURING ONE HALF OF A GIVEN TIME SLOT, AND FOR ACTUATING THE OTHER OF SAID TIME-DIVISION SWITCHES IN EACH OF SAID SUBSCRIBER CIRCUITS AND BOTH OF SAID SECOND GATING MEANS DURING THE OTHER HALF OF SAID GIVEN TIME SLOT.
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) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |