US3231678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subscriber controlled conference circuit
Assignee: AT&T Inc
•
Filing: 1962-06-25
•
Granted: 1966-01-25
•
Expires: 1982-06-25
Abstract
No abstract record available.
Inventors
- 👤 Brendan A Ward
- 👤 Zarouni Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:31
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
IN A TELEPHONE SYSTEM, A PLURALITY OF LINES, A SPECIAL SERVICE LINE, SWITCHING MEANS COMPRISING MEANS FOR ALTERNATIVELY ESTABLISHING OUTGOING CONNECTIONS AND INCOMING CONNECTIONS BETWEEN SAID SPECIAL SERVICE LINE AND ANY OF SAID PLURALITY OF LINES, AND SPECIAL SERVICE MEANS CONTROLLED BY SAID SPECIAL SERVICE LINE FOR ADDING ANOTHER ONE OF SAID PLURALITY OF LINES TO ANY OF SAID ESTABLISHED CONNECTIONS.
Claim 2
Dependent Claim
61 words
IN A TELEPHONE SYSTEM, A PLURALITY OF LINES, A SPECIAL SERVICE LINE, SWITCHING MEANS COMPRISING MEANS FOR ALTERNATIVELY ESTABLISHING OUTGOING CONNECTIONS AND INCOMING CONNECTIONS BETWEEN SAID SPECIAL SERVICE LINE AND ANY OF SAID PLURALITY OF LINES, AND SPECIAL SERVICE MEANS CONTROLLED BY SAID SPECIAL SERVICE LINE FOR ADDING ANOTHER ONE OF SAID PLURALITY OF LINES TO ANY OF SAID ESTABLISHED CONNECTIONS.
References Cited (Backward Citations)
US1312778A
Cited
US2958734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |