US3159721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Outgoing trunk identification circuit
Assignee: AT&T Inc
•
Filing: 1960-07-13
•
Granted: 1964-12-01
•
Expires: 1980-07-13
Abstract
No abstract record available.
Inventors
- 👤 Royce D Deming
- 👤 Donald A James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:42
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN A TELEPHONE SWITCHING OFFICE, TRUNKS INCOMING THERETO, OUTGOING TRUNKS EXTENDING THEREFROM TO OTHER OFFICES, SWITCHES FOR CONNECTING SAID INCOMING TRUNKS TO SAID OUTGOING TRUNKS COMMON CONTROL EQUIPMENT UNITS, MEANS FOR CONNECTING ANY CALLING ONE OF SAID INCOMING TRUNKS WITH ONE OF SAID INCOMING OF SAID EQUIPMENT UNITS FOR REGISTERING CALLED OFFICE INFORMATION TRANSMITTED OVER A CALLED TRUNK CURRENTLY CONNECTED THERETO, MEANS RESPONSIVE TO SAID CALLED OFFICE REGISTRATION IN ANY EQUIPMENT UNIT FOR CONNECTING SAID LAST-NAMED EQUIPMENT UNIT AND THE CALLING TRUNK CUR-
Claim 2
Dependent Claim
83 words
IN A TELEPHONE SWITCHING OFFICE, TRUNKS INCOMING THERETO, OUTGOING TRUNKS EXTENDING THEREFROM TO OTHER OFFICES, SWITCHES FOR CONNECTING SAID INCOMING TRUNKS TO SAID OUTGOING TRUNKS COMMON CONTROL EQUIPMENT UNITS, MEANS FOR CONNECTING ANY CALLING ONE OF SAID INCOMING TRUNKS WITH ONE OF SAID INCOMING OF SAID EQUIPMENT UNITS FOR REGISTERING CALLED OFFICE INFORMATION TRANSMITTED OVER A CALLED TRUNK CURRENTLY CONNECTED THERETO, MEANS RESPONSIVE TO SAID CALLED OFFICE REGISTRATION IN ANY EQUIPMENT UNIT FOR CONNECTING SAID LAST-NAMED EQUIPMENT UNIT AND THE CALLING TRUNK CUR-
References Cited (Backward Citations)
US2873322A
Cited
US2878328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |