US3182134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for interconnecting a number of calling lines
Assignee: AT&T Inc
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Filing: 1959-12-11
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Granted: 1965-05-04
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Expires: 1979-12-11
Abstract
No abstract record available.
Inventors
- 👤 Hochgraf Lester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:10
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
AN AUTOMATIC TELEPHONE SYSTEM FOR INTERCONNECTING A PLURALITY OF CALLING LINES INCLUDING A FIRST GROUP OF TERMINALS HAVING A FIRST NUMBER DESIGNATION, A SECOND GROUP OF TERMINALS HAVING A SEDOND NUMBER DESIGNATION, CONNECTING MEANS PERMANENTLY COUPLING SAID TERMINALS TO PERMIT COMMUNICATION THEREBETWEEN, MEANS RESPONSIVE TO AN IDLE CONDITION ON SAID FIRST GROUP OF TERMINALS AND THE TRANSMISSION OF SIGNALS REPRESENTING SAID FIRST NUMBER DESIGNATION FOR CONNECTING A CALLING LINE TO SAID FIRST TERMINALS, MEANS FOR SUPPLYING RINGING CURRENT TO SAID FIRST TERMINALS, IMPEDANCE MEANS CONNECTED TO SAID TERMINALS AND ADAPTED TO PRESENT A RELATIVELY LOW IMPEDANCE TO DIRECT-CURRENT SIGNALS AND A RELATIVELY HIGH IMPEDANCE TO ALTERNATINGCURRENT SIGNALS FOR TRIPPING SAID RINGING MEANS, AND MEANS RESPONSIVE TO THE TRIPPING SAID RINGING MEANS FOR TRANSMITTING A SIGNAL TO SAID CALLING LINE REPRESENTING A REVENUE CHARGE INDICATION.
Claim 2
Dependent Claim
134 words
AN AUTOMATIC TELEPHONE SYSTEM FOR INTERCONNECTING A PLURALITY OF CALLING LINES INCLUDING A FIRST GROUP OF TERMINALS HAVING A FIRST NUMBER DESIGNATION, A SECOND GROUP OF TERMINALS HAVING A SEDOND NUMBER DESIGNATION, CONNECTING MEANS PERMANENTLY COUPLING SAID TERMINALS TO PERMIT COMMUNICATION THEREBETWEEN, MEANS RESPONSIVE TO AN IDLE CONDITION ON SAID FIRST GROUP OF TERMINALS AND THE TRANSMISSION OF SIGNALS REPRESENTING SAID FIRST NUMBER DESIGNATION FOR CONNECTING A CALLING LINE TO SAID FIRST TERMINALS, MEANS FOR SUPPLYING RINGING CURRENT TO SAID FIRST TERMINALS, IMPEDANCE MEANS CONNECTED TO SAID TERMINALS AND ADAPTED TO PRESENT A RELATIVELY LOW IMPEDANCE TO DIRECT-CURRENT SIGNALS AND A RELATIVELY HIGH IMPEDANCE TO ALTERNATINGCURRENT SIGNALS FOR TRIPPING SAID RINGING MEANS, AND MEANS RESPONSIVE TO THE TRIPPING SAID RINGING MEANS FOR TRANSMITTING A SIGNAL TO SAID CALLING LINE REPRESENTING A REVENUE CHARGE INDICATION.
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) | 1968-05-03 | 1968-11-02 | 1969-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-03 | 1972-11-02 | 1973-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-03 | 1976-11-02 | 1977-05-04 | $7700.00 | Window Closed / Lapsed |