Patent US3188401A successfully refreshed from Google Patents.
US3188401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective service observing circuit
Assignee: AT&T Inc
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Filing: 1961-11-15
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Granted: 1965-06-08
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Expires: 1981-11-15
Abstract
No abstract record available.
Inventors
- 👤 William G Barrett
- 👤 George E Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:18
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/22; H04M3/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
IN A TELEPHONE SYSTEM INCLUDING A PLURALITY OF ATTENDANT-CONTROLLED PRIVATE BRANCH EXCHANGES EACH ASSOCIATED WITH A RESPECTIVE ONE OF A PLURALITY OF TRUNKS, A SERVICE OBSERVING CIRCUIT COMPRISING MEANS FOR STORING A PLURALITY OF NUMERICAL INDICATIONS EACH CORRESPONDING TO THE CALLING NUMBER OF A RESPECTIVE ONE OF SAID PRIVATE BRANCH EXCHANGES, MEANS RESPONSIVE TO DIAL PULSES ON ANY ONE OF SAID TRUNKS FOR COMPARING THE NUMBERS CORRESPONDING ING TO SAID DIAL PULSES WITH THE NUMBERS CORRESPONDING TO SAID INDICATIONS, AND MEANS RESPONSIVE ONLY TO A MATCH BETWEEN A STORED ONE OF SAID NUMERICAL INDICATIONS AND A NUMBER CORRESPONDING TO SAID DIAL PULSES AS DETERMINED BY SAID COMPARING MEANS FOR GENERATING A SERVICE OBSERVING ALERTING SIGNAL, WHEREBY SERVICE OBSERVING MAY BE RESTRICTED TO CALLS MADE TO SAID PRIVATE BRANCH EXCHANGE
Claim 2
Dependent Claim
129 words
IN A TELEPHONE SYSTEM INCLUDING A PLURALITY OF ATTENDANT-CONTROLLED PRIVATE BRANCH EXCHANGES EACH ASSOCIATED WITH A RESPECTIVE ONE OF A PLURALITY OF TRUNKS, A SERVICE OBSERVING CIRCUIT COMPRISING MEANS FOR STORING A PLURALITY OF NUMERICAL INDICATIONS EACH CORRESPONDING TO THE CALLING NUMBER OF A RESPECTIVE ONE OF SAID PRIVATE BRANCH EXCHANGES, MEANS RESPONSIVE TO DIAL PULSES ON ANY ONE OF SAID TRUNKS FOR COMPARING THE NUMBERS CORRESPONDING ING TO SAID DIAL PULSES WITH THE NUMBERS CORRESPONDING TO SAID INDICATIONS, AND MEANS RESPONSIVE ONLY TO A MATCH BETWEEN A STORED ONE OF SAID NUMERICAL INDICATIONS AND A NUMBER CORRESPONDING TO SAID DIAL PULSES AS DETERMINED BY SAID COMPARING MEANS FOR GENERATING A SERVICE OBSERVING ALERTING SIGNAL, WHEREBY SERVICE OBSERVING MAY BE RESTRICTED TO CALLS MADE TO SAID PRIVATE BRANCH EXCHANGE
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) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |