US3116375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stage line concentrator system
Assignee: AT&T Inc
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Filing: 1959-10-26
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Granted: 1963-12-31
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Expires: 1979-10-26
Abstract
No abstract record available.
Inventors
- 👤 John A Harr
- 👤 Terrell N Lowry
- 👤 Isaac D Nehama
- 👤 Philip G Ridinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:14
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/521
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
124 words
A TWO-STAGE REMOTE TELEPHONE CONCENTRATOR SYSTEM INCLUDING A CENTRAL OFFICE, A PLURALITY OF LINES, A SMALLER PLURALITY OF LINKS, A STILL SMALLER PLURALITY OF TRUNKS, A PRIMARY CONCENTRATOR FOR CONNECTING SAID LINES TO SAID LINKS, A SECONDARY CONCENTRATOR FOR CONNECTING SAID LINKS TO SAID TRUNKS, SAID CONCENTRATORS INCLUDING CROSSPOINT NETWORK SWITCHES, REMOTE NETWORK CONTROL MEANS AT SAID CENTRAL OFFICE FOR TRANSMITTING CONTROL SIGNALS TO SAID REMOTE CONCENTRATORS TO OPERATE PARTICULAR CROSSPOINTS TO SELECT PARTICULAR CHANNELS THERETHROUGH SAID REMOTE NETWORK CONTROL MEANS BEING ADAPTED TO TRANSMIT SAID CONTROL SIGNALS SIMULTANEOUSLY TO SAID REMOTE PRIMARY CONCENTRATOR AND SAID REMOTE SECONDARY CONCENTRATOR, AND MEANS AT SAID REMOTE SECONDARY CONCENTRATOR RESPONSIVE TO THE CLOSURE OF A CROSSPOINT THEREAT FOR TRANSMITTING A SIGNAL INDICATIVE THEREOF TO SAID CENTRAL OFFICE.
References Cited (Backward Citations)
US2957949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-12-30 | 1967-07-01 | 1967-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-30 | 1971-07-01 | 1971-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-30 | 1975-07-01 | 1975-12-31 | $7700.00 | Window Closed / Lapsed |