US3172956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time division switching system for telephone system utilizing time-slot interchange
Assignee: AT&T Inc
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Filing: 1960-04-27
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Granted: 1965-03-09
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Expires: 1980-04-27
Abstract
No abstract record available.
Inventors
- 👤 Inose Hiroshi
- 👤 John P Runyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:32
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN A COMMUNICATION SYSTEM, A PLURALITY OF LINES, A CENTRAL OFFICE, A PLURALITY OF CONCENTRATIONS REMOTE FROM SAID CENTRAL OFFICE EACH TERMINATING A DISTINCT GROUP OF SAID LINES, MEANS FOR TRANSMITTING INFORMATION BETWEEN ACTIVE PAIRS OF SAID LINES THROUGH SAID CENTRAL OFFICE COMPRISING A DISTINCT TRANSMISSION CHANNEL EXTENDING BETWEEN EACH CONCENTRATOR AND THE CENTRAL OFFICE, A TIME DIVISION SWITCHING NETWORK ASSOCIATED WITH EACH OF SAID CONCENTRATORS FOR INTERCONNECTING PAIRS OF SAID LINES IN DISTINCE TIME SLOTS OF A REPETITIVE CYCLE, AND MEANS FOR TRANSPOSING INFORMATION RECEIVED OVER SAID DISTINCT TRANSMISSION CHANNEL FROM A CALLING LINE IN ONE CONCENTRATOR IN ONE TIME SLOT TO A DIFFERENT TIME SLOT FOR TRANSMISSION OVER THE DISTINCT TRANSMISSION CHANNEL CONNECTED TO THE CONCENTRATOR ASSOCIATED WITH THE CALLED LINE.
Claim 2
Dependent Claim
123 words
IN A COMMUNICATION SYSTEM, A PLURALITY OF LINES, A CENTRAL OFFICE, A PLURALITY OF CONCENTRATIONS REMOTE FROM SAID CENTRAL OFFICE EACH TERMINATING A DISTINCT GROUP OF SAID LINES, MEANS FOR TRANSMITTING INFORMATION BETWEEN ACTIVE PAIRS OF SAID LINES THROUGH SAID CENTRAL OFFICE COMPRISING A DISTINCT TRANSMISSION CHANNEL EXTENDING BETWEEN EACH CONCENTRATOR AND THE CENTRAL OFFICE, A TIME DIVISION SWITCHING NETWORK ASSOCIATED WITH EACH OF SAID CONCENTRATORS FOR INTERCONNECTING PAIRS OF SAID LINES IN DISTINCE TIME SLOTS OF A REPETITIVE CYCLE, AND MEANS FOR TRANSPOSING INFORMATION RECEIVED OVER SAID DISTINCT TRANSMISSION CHANNEL FROM A CALLING LINE IN ONE CONCENTRATOR IN ONE TIME SLOT TO A DIFFERENT TIME SLOT FOR TRANSMISSION OVER THE DISTINCT TRANSMISSION CHANNEL CONNECTED TO THE CONCENTRATOR ASSOCIATED WITH THE CALLED LINE.
References Cited (Backward Citations)
US2917583A
Cited
US3049593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |