US3136984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency transfer circuit
Assignee: AT&T Inc
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Filing: 1961-05-04
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Granted: 1964-06-09
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Expires: 1981-05-04
Abstract
No abstract record available.
Inventors
- 👤 Joseph F Morrongiello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:13
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/50; H04M3/51; H04M3/523
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
IN A SWITCHING SYSTEM, A FIRST LINE, A SECOND LINE, A CIRCUIT NORMALLY CONNECTED TO SAID FIRST LINE, A FIRST RELAY EFFECTIVE UPON OPERATION TO TRANSFER SAID CIRCUIT FROM SAID FIRST LINE TO SAID SECOND LINE, AND MEANS FOR CONTROLLING THE OPERATION AND RELEASE OF SAID FIRST RELAY, SAID CONTROLLING MEANS INCLUDING A SECOND RELAY OPERATION OF WHICH IS EFFECTIVE TO CAUSE OPERATION OF SAID FIRST RELAY, A LOCKING KEY AND A NONLOCKING KEY, A THIRD RELAY OPERATED BY OPERATION OF SAID LOCKING KEY, MEANS INCLUDING A FIRST CONTACT OF SAID THIRD RELAY EFFECTED ONLY BY SEQUENTIAL OPERATION OF SAID LOCKING KEY FOLLOWED BY OPERATION OF SAID NONLOCKING KEY FOR OPERATING SAID SECOND RELAY, MEANS EFFECTIVE UPON OPERATION OF SAID SECOND RELAY FOR HOLDING SAID SECOND RELAY OPERATED, AND MEANS INCLUDING A SECOND CONTACT OF SAID THIRD RELAY EFFECTED ONLY BY RELEASE OF SAID LOCKING KEY FOLLOWED BY OPERATION OF SAID NONLOCKING KEY FOR RELEASING SAID SECOND RELAY.
Claim 2
Dependent Claim
158 words
IN A SWITCHING SYSTEM, A FIRST LINE, A SECOND LINE, A CIRCUIT NORMALLY CONNECTED TO SAID FIRST LINE, A FIRST RELAY EFFECTIVE UPON OPERATION TO TRANSFER SAID CIRCUIT FROM SAID FIRST LINE TO SAID SECOND LINE, AND MEANS FOR CONTROLLING THE OPERATION AND RELEASE OF SAID FIRST RELAY, SAID CONTROLLING MEANS INCLUDING A SECOND RELAY OPERATION OF WHICH IS EFFECTIVE TO CAUSE OPERATION OF SAID FIRST RELAY, A LOCKING KEY AND A NONLOCKING KEY, A THIRD RELAY OPERATED BY OPERATION OF SAID LOCKING KEY, MEANS INCLUDING A FIRST CONTACT OF SAID THIRD RELAY EFFECTED ONLY BY SEQUENTIAL OPERATION OF SAID LOCKING KEY FOLLOWED BY OPERATION OF SAID NONLOCKING KEY FOR OPERATING SAID SECOND RELAY, MEANS EFFECTIVE UPON OPERATION OF SAID SECOND RELAY FOR HOLDING SAID SECOND RELAY OPERATED, AND MEANS INCLUDING A SECOND CONTACT OF SAID THIRD RELAY EFFECTED ONLY BY RELEASE OF SAID LOCKING KEY FOLLOWED BY OPERATION OF SAID NONLOCKING KEY FOR RELEASING SAID SECOND RELAY.
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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |