Patent US3138670A successfully refreshed from Google Patents.
US3138670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic test equipment for multiterminal communication systems
Assignee: AT&T Inc
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Filing: 1961-08-29
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Granted: 1964-06-23
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Expires: 1981-08-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Joseph Maurushat
- 👤 Norman A Newell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:33
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/16; H04M; H04M3/00; H04M3/08; H04M3/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
IN COMBINATION, A FIRST AND A SECOND COMMUNICATION TERMINAL, MEANS FOR TRANSMITTING COMMUNICATION SIGNALS FROM SAID FIRST TO SAID SECOND TERMINAL, MEANS AT SAID FIRST TERMINAL RESPONSIVE TO A DEGRADATION IN THE TRANSMISSION OF A PREDETERMINED ONE OF SAID SIGNALS FOR IMMEDIATELY INDICATING AN ALARM CONDITION, MEANS AT EACH OF SAID TERMINALS OPERABLE INDEPENDENTLY IN RESPONSE TO SAID ALARM CONDITION FOR CONCURRENTLY TRANSMITTING TEST SIGNALS IN EACH DIRECTION BETWEEN SAID TERMINALS, AND MEANS RESPONSIVE TO THE SATISFACTORY RECEPTION OF SAID TEST SIGNALS AT EACH OF SAID TERMINALS FOR CANCELLING SAID ALARM CONDITION.
Claim 2
Dependent Claim
92 words
IN COMBINATION, A FIRST AND A SECOND COMMUNICATION TERMINAL, MEANS FOR TRANSMITTING COMMUNICATION SIGNALS FROM SAID FIRST TO SAID SECOND TERMINAL, MEANS AT SAID FIRST TERMINAL RESPONSIVE TO A DEGRADATION IN THE TRANSMISSION OF A PREDETERMINED ONE OF SAID SIGNALS FOR IMMEDIATELY INDICATING AN ALARM CONDITION, MEANS AT EACH OF SAID TERMINALS OPERABLE INDEPENDENTLY IN RESPONSE TO SAID ALARM CONDITION FOR CONCURRENTLY TRANSMITTING TEST SIGNALS IN EACH DIRECTION BETWEEN SAID TERMINALS, AND MEANS RESPONSIVE TO THE SATISFACTORY RECEPTION OF SAID TEST SIGNALS AT EACH OF SAID TERMINALS FOR CANCELLING SAID ALARM CONDITION.
References Cited (Backward Citations)
US2986610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |