US3201523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
P. b. x. trunk circuit for restrictor
Assignee: North Electric Co
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Filing: 1961-11-20
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Granted: 1965-08-17
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Expires: 1981-11-20
Abstract
No abstract record available.
Inventors
- 👤 William H Blashfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:22
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/58; H04Q3/62; H04Q3/625
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
IN AN AUTOMATIC TELEPHONE SYSTEM INCLUDING A PRIVATE BRANCH EXCHANGE FOR EXTENDING CONNECTIONS BETWEEN STATIONS IN THE EXCHANGE AND A TRUNK CIRCUIT HAVING A DIRECT CURRENT COMMUNICATION PATH, A FIRST SWITCHING MEANS OPERATIVE TO SEIZE SAID TRUNK CIRCUIT AND EXTEND A CONNECTION OVER A CALLING LOOP FROM A CALLING STATION TO SAID PATH, A SECOND SWITCHING MEANS INCLUDING SAID TRUNK CIRCUIT OPERATIVE RESPONSIVE TO EXTENSION OF A CONNECTION OVER SAID FIRST SWITCHING MEANS TO SAID PATH FROM ONE OF SAID STATIONS TO EXTEND SAID PATH TOWARD A SECOND EXCHANGE, AND MEANS IN SAID TRUNK CIRCUIT INCLUDING A FIRST SWITCHING MEANS AUTOMATICALLY OPERATIVE TO RELEASE SAID TRUNK A PREDETERMINED PERIOD AFTER INTERRUPTION OF SAID CALLING LOOP AT SAID STATION, AND A SECOND MEANS FOR MAINTAINING SAID FIRST SWITCHING MEANS OPERATIVE TO EFFECT SAID RELEASE EVEN IF THE CALLING LOOP IS RE-ESTABLISHED FROM SAID STATION TO THE TRUNK CIRCUIT DURING SAID DELAY PERIOD.
Claim 2
Dependent Claim
151 words
IN AN AUTOMATIC TELEPHONE SYSTEM INCLUDING A PRIVATE BRANCH EXCHANGE FOR EXTENDING CONNECTIONS BETWEEN STATIONS IN THE EXCHANGE AND A TRUNK CIRCUIT HAVING A DIRECT CURRENT COMMUNICATION PATH, A FIRST SWITCHING MEANS OPERATIVE TO SEIZE SAID TRUNK CIRCUIT AND EXTEND A CONNECTION OVER A CALLING LOOP FROM A CALLING STATION TO SAID PATH, A SECOND SWITCHING MEANS INCLUDING SAID TRUNK CIRCUIT OPERATIVE RESPONSIVE TO EXTENSION OF A CONNECTION OVER SAID FIRST SWITCHING MEANS TO SAID PATH FROM ONE OF SAID STATIONS TO EXTEND SAID PATH TOWARD A SECOND EXCHANGE, AND MEANS IN SAID TRUNK CIRCUIT INCLUDING A FIRST SWITCHING MEANS AUTOMATICALLY OPERATIVE TO RELEASE SAID TRUNK A PREDETERMINED PERIOD AFTER INTERRUPTION OF SAID CALLING LOOP AT SAID STATION, AND A SECOND MEANS FOR MAINTAINING SAID FIRST SWITCHING MEANS OPERATIVE TO EFFECT SAID RELEASE EVEN IF THE CALLING LOOP IS RE-ESTABLISHED FROM SAID STATION TO THE TRUNK CIRCUIT DURING SAID DELAY PERIOD.
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) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |