US3346855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for monitoring the state of a relay
Assignee: AT&T Inc
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Filing: 1964-05-18
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Granted: 1967-10-10
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Expires: 1984-05-18
Abstract
No abstract record available.
Inventors
- 👤 John D Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:16
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/16; H01H9/167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
APPARATUS FOR MONITORING THE CONDITION OF A RELAY COMPRISING A TRANSFORMER HAVING A PRIMARYL CIRCUIT AND A SECONDARY CIRCUIT, A PERIODIC SIGNAL SOURCE, MEANS FOR COUPLING THE OUTPUT OF SAID SOURCE TO A PRIMARY CIRCUIT IN ONE PHASE WHEN SAID RELAY IS IN A FIRST STATE AND CUIT IN ONE PHASE WHEN SAID RELAY IS IN A FIRST STATE AND FOR COUPLING THE OUTPUT OF SAID SOURCE TO SAID PRIMARY CICRUIT SO AS TO TRANSMIT THE PERIODIC SIGNAL TO SAID SECONDARY CIRCUIT IN AN OPPOSITE WHEN SAID RELAY IS IN A SECOND STATE, MEANS FOR COMPARING THE PHASE OF THE SIGNAL TRANSMITTED TO SAID SECONDARY CIRCUIT WITH THE OUTPUT OF SAID SOURCE, SAID COMPARING MEANS INCLUDING FIRST AND SECOND COINCIDENCE DETECTION MEANS COUPLED TO SAID SECONDARY CIRCUIT, MEANS TO DIRECTLY COUPLE ONE PHASE AND THE OPPOSITE PHASE OF THE OUTPUT OF SAID PERIODIC SIGNAL
Claim 2
Dependent Claim
144 words
APPARATUS FOR MONITORING THE CONDITION OF A RELAY COMPRISING A TRANSFORMER HAVING A PRIMARYL CIRCUIT AND A SECONDARY CIRCUIT, A PERIODIC SIGNAL SOURCE, MEANS FOR COUPLING THE OUTPUT OF SAID SOURCE TO A PRIMARY CIRCUIT IN ONE PHASE WHEN SAID RELAY IS IN A FIRST STATE AND CUIT IN ONE PHASE WHEN SAID RELAY IS IN A FIRST STATE AND FOR COUPLING THE OUTPUT OF SAID SOURCE TO SAID PRIMARY CICRUIT SO AS TO TRANSMIT THE PERIODIC SIGNAL TO SAID SECONDARY CIRCUIT IN AN OPPOSITE WHEN SAID RELAY IS IN A SECOND STATE, MEANS FOR COMPARING THE PHASE OF THE SIGNAL TRANSMITTED TO SAID SECONDARY CIRCUIT WITH THE OUTPUT OF SAID SOURCE, SAID COMPARING MEANS INCLUDING FIRST AND SECOND COINCIDENCE DETECTION MEANS COUPLED TO SAID SECONDARY CIRCUIT, MEANS TO DIRECTLY COUPLE ONE PHASE AND THE OPPOSITE PHASE OF THE OUTPUT OF SAID PERIODIC SIGNAL
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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |