US3214523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telephone system with camp-on facilities
Assignee: AT&T Inc
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Filing: 1962-03-15
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Granted: 1965-10-26
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Expires: 1982-03-15
Abstract
No abstract record available.
Inventors
- 👤 Bobby L Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:16
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN A TELEPHONE SYSTEM, A CALLING LINE, A SWITCHING CENTER, AND A BUSY CALLED LINE, MEANS AT SAID SWITCHING CENTER FOR ANNOUNCING THE BUSY CONDITION OF THE CALLED LINE TO THE CALLING SUBSCRIBER AND FOR GIVING PROCEDURAL INSTRUCTIONS, MEANS AT THE SWITCHING CENTER FOR REGISTERING PULSES DIALED BY THE CALLING STATION IDENTIFYING BOTH THE CALLING STATION AND THE CALLED STATION, MEANS EFFECTIVE UPON COMPLETION OF THE DIALING FOR RELEASING THE ORIGINAL CALLING SWITCH TRAIN, MEANS EFFECTIVE IN A PREDETERMINED INTERVAL FOLLOWING REGISTRATION OF THE IDENTIFYING PULSES FOR CHECKING THE CONDITION OF SAID CALLED LINE, AND MEANS EFFECTIVE WHEN SAID CALLED LINE IS FOUND IN NONBUSY CONDITION FOR RECALLING THE CALLING SUBSCRIBER.
Claim 2
Dependent Claim
111 words
IN A TELEPHONE SYSTEM, A CALLING LINE, A SWITCHING CENTER, AND A BUSY CALLED LINE, MEANS AT SAID SWITCHING CENTER FOR ANNOUNCING THE BUSY CONDITION OF THE CALLED LINE TO THE CALLING SUBSCRIBER AND FOR GIVING PROCEDURAL INSTRUCTIONS, MEANS AT THE SWITCHING CENTER FOR REGISTERING PULSES DIALED BY THE CALLING STATION IDENTIFYING BOTH THE CALLING STATION AND THE CALLED STATION, MEANS EFFECTIVE UPON COMPLETION OF THE DIALING FOR RELEASING THE ORIGINAL CALLING SWITCH TRAIN, MEANS EFFECTIVE IN A PREDETERMINED INTERVAL FOLLOWING REGISTRATION OF THE IDENTIFYING PULSES FOR CHECKING THE CONDITION OF SAID CALLED LINE, AND MEANS EFFECTIVE WHEN SAID CALLED LINE IS FOUND IN NONBUSY CONDITION FOR RECALLING THE CALLING SUBSCRIBER.
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) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |