US3225144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone switching system
Assignee: AT&T Inc
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Filing: 1962-05-16
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Granted: 1965-12-21
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Expires: 1982-05-16
Abstract
No abstract record available.
Inventors
- 👤 Robert C Gebhardt
- 👤 Jr William L Shafer
- 👤 Jr Albert E Spencer
- 👤 Wing N Toy
- 👤 Frank S Vigliante
- 👤 Robert D Williams
- 👤 Bronxville Oscar H Williford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:57
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0407
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A TELEPHONE SWITCHING SYSTEM COMPRISING A TELEPHONE CENTRAL OFFICE, A PLURALITY OF PRIVATE BRANCH EXCHANGES, A CONTROL UNIT COMMON TO SAID PLURALITY OF PRIVATE BRANCH EXCHANGES, A SWITCHING NETWORK AT EACH OF SAID PRIVATE BRANCH EXCHANGES, A PLURALITY OF EXTENSIONS TERMINATING ON EACH OF SAID NETWORK, A PLURALITY OF TRUNKS TERMINATING ON EACH OF SAID NETWORKS, INDEPENDENT SCANNING AND MEMORY MEANS AT EACH OF SAID PRIVATE BRANCH EXCHANGES FOR MAINTAINING RECORDS OF THE SUPERVISORY STATES OF SAID EXTENSIONS AND SAID TRUNKS, DATA COMMUNICATION MEANS
Claim 2
Dependent Claim
84 words
A TELEPHONE SWITCHING SYSTEM COMPRISING A TELEPHONE CENTRAL OFFICE, A PLURALITY OF PRIVATE BRANCH EXCHANGES, A CONTROL UNIT COMMON TO SAID PLURALITY OF PRIVATE BRANCH EXCHANGES, A SWITCHING NETWORK AT EACH OF SAID PRIVATE BRANCH EXCHANGES, A PLURALITY OF EXTENSIONS TERMINATING ON EACH OF SAID NETWORK, A PLURALITY OF TRUNKS TERMINATING ON EACH OF SAID NETWORKS, INDEPENDENT SCANNING AND MEMORY MEANS AT EACH OF SAID PRIVATE BRANCH EXCHANGES FOR MAINTAINING RECORDS OF THE SUPERVISORY STATES OF SAID EXTENSIONS AND SAID TRUNKS, DATA COMMUNICATION MEANS
References Cited (Backward Citations)
US3049593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |