Patent US1407947A successfully refreshed from Google Patents.
US3235666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Universal telephone line concentrator system
Assignee: AT&T Inc
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Filing: 1962-06-29
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Granted: 1966-02-15
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Expires: 1982-06-29
Abstract
No abstract record available.
Inventors
- 👤 James C Ewin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:07
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A TELEPHONE LINE CONCENTRATION SYSTEM INCLUDING A CENTRAL OFFICE, A PLURALITY OF SUBSTRATION LINES, A LESSER PLURALITY OF TRUNKS EXTENDING FROM SAID OFFICE, CONCENTRATOR MEANS FOR CONNECTING SAID LINES TO SAID TRUNKS UNDER CONTROL OF SAID OFFICE, SAID TRUNKS INCLUDING SPEECH TRUNKS AND A CONTROL TRUNK, MEANS FOR PRESELECTING A SPEECH TRUNK NEXT TO BE CONNECTED TO A CALLING LINE, AND SIGNALLING MEANS AT
Claim 2
Dependent Claim
64 words
A TELEPHONE LINE CONCENTRATION SYSTEM INCLUDING A CENTRAL OFFICE, A PLURALITY OF SUBSTRATION LINES, A LESSER PLURALITY OF TRUNKS EXTENDING FROM SAID OFFICE, CONCENTRATOR MEANS FOR CONNECTING SAID LINES TO SAID TRUNKS UNDER CONTROL OF SAID OFFICE, SAID TRUNKS INCLUDING SPEECH TRUNKS AND A CONTROL TRUNK, MEANS FOR PRESELECTING A SPEECH TRUNK NEXT TO BE CONNECTED TO A CALLING LINE, AND SIGNALLING MEANS AT
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) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |