US3171898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone systems
Assignee: AT&T Inc
•
Filing: 1959-02-10
•
Granted: 1965-03-02
•
Expires: 1979-02-10
Abstract
No abstract record available.
Inventors
- 👤 Robert B Sladek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:26
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
IN A TELEPHONE SYSTEM, A FINAL SELECTOR SWITCH INCLUDING A MULTIPLE SWITCH BANK AND HAVING A PLURALITY OF WIPER SETS CONNECTIBLE TO DIFFERENT GROUPS OF SUBSCRIBER LINES, SAID FINAL SELECTOR HAVING A PULSING CIRCUIT FOR POSITIONING THE WIPER SETS, A PRECEDING SELECTOR SWITCH HAVING A PAIR OF PATHS OVER WHICH A CALL MAY BE DIRECTED AND CONNECTIBLE TO SEIZE THE FINAL SELECTOR AND TO OPERATE SAID PULSING CIRCUIT, MEANS PLACED IN A CONTROL CONDITION BY THE PRECEDING SELECTOR SIMULTANEOUSLY WITH THE SEIZURE OF THE FINAL SELECTOR FOR RENDERIG EFFECTIVE A WIPER SET DEPENDING UPON THE PATH OVER WHICH THE CALL WAS DIRECTED, AND RELAY MEANS WITHIN THE FINAL SELECTOR OPERATED UPON COMPLETION OF THE SEIZURE FOR MAINTAINING SAID MEANS IN THE CONTROL CONDITION AND APPLYING A BUSY TEST SIGNAL TO THE PATH NOT USED FOR THE CALL.
Claim 2
Dependent Claim
137 words
IN A TELEPHONE SYSTEM, A FINAL SELECTOR SWITCH INCLUDING A MULTIPLE SWITCH BANK AND HAVING A PLURALITY OF WIPER SETS CONNECTIBLE TO DIFFERENT GROUPS OF SUBSCRIBER LINES, SAID FINAL SELECTOR HAVING A PULSING CIRCUIT FOR POSITIONING THE WIPER SETS, A PRECEDING SELECTOR SWITCH HAVING A PAIR OF PATHS OVER WHICH A CALL MAY BE DIRECTED AND CONNECTIBLE TO SEIZE THE FINAL SELECTOR AND TO OPERATE SAID PULSING CIRCUIT, MEANS PLACED IN A CONTROL CONDITION BY THE PRECEDING SELECTOR SIMULTANEOUSLY WITH THE SEIZURE OF THE FINAL SELECTOR FOR RENDERIG EFFECTIVE A WIPER SET DEPENDING UPON THE PATH OVER WHICH THE CALL WAS DIRECTED, AND RELAY MEANS WITHIN THE FINAL SELECTOR OPERATED UPON COMPLETION OF THE SEIZURE FOR MAINTAINING SAID MEANS IN THE CONTROL CONDITION AND APPLYING A BUSY TEST SIGNAL TO THE PATH NOT USED FOR THE CALL.
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) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |