Patent US3210476A successfully refreshed from Google Patents.
US3210476A
Expired / Lapsed
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Automatic switching circuits for establishing conference connections
Assignee: AT&T Inc
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Filing: 1961-10-30
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Granted: 1965-10-05
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Expires: 1981-10-30
Abstract
No abstract record available.
Inventors
- 👤 Norman R Shaer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:35
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/56; H04M2203/00; H04M2203/50; H04M2203/5063
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
IN COMBINATION IN A TELEPHONE SWITCHING SYSTEM, A SUBSCRIBER''S LINE, A CONFERENCE CIRCUIT, MEANS TO ESTABLISH A CONNECTION FROM SAID SUBSCRIBER''S LINE TO SAID CONFERENCE CIRCUIT, A CONFERENCE PROGRAM CIRCUIT, MEANS FOR OPERATING SAID CONFERENCE PROGRAM CIRCUIT, AND MEANS CONTROLLED BY SAID CONFERENCE PROGRAM CIRCUIT FOR THEREAFTER ESTABLISHING A PLURALITY OF CONNECTIONS FROM SAID CONFERENCE CIRCUIT TO PREDETERMINED SUBSCRIBERS'' STATIONS.
Claim 2
Dependent Claim
60 words
IN COMBINATION IN A TELEPHONE SWITCHING SYSTEM, A SUBSCRIBER''S LINE, A CONFERENCE CIRCUIT, MEANS TO ESTABLISH A CONNECTION FROM SAID SUBSCRIBER''S LINE TO SAID CONFERENCE CIRCUIT, A CONFERENCE PROGRAM CIRCUIT, MEANS FOR OPERATING SAID CONFERENCE PROGRAM CIRCUIT, AND MEANS CONTROLLED BY SAID CONFERENCE PROGRAM CIRCUIT FOR THEREAFTER ESTABLISHING A PLURALITY OF CONNECTIONS FROM SAID CONFERENCE CIRCUIT TO PREDETERMINED SUBSCRIBERS'' STATIONS.
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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |