Patent US5174487A successfully refreshed from Google Patents.
Patent US3312867A successfully refreshed from Google Patents.
US3312867A
Expired / Lapsed
US
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Static time-overcurrent relays
Assignee: Westinghouse Electric Corp
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Filing: 1963-04-26
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Granted: 1967-04-04
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Expires: 1983-04-26
Abstract
No abstract record available.
Inventors
- 👤 William K Sonnemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:32
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/08; H02H3/093
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A TIME-OVERCURRENT RELAY COMPRISING A PAIR OF TRANSFORMERS EACH HAVING PRIMARY AND SECONDARY WINDINGS THEREON, ONE OF SAID TRANSFORMERS BEING DESIGNED TO SATURATE AT HIGH VOLTAGE AND CURRENT CONDITIONS AND THE OTHER TRANSFORMER BEING DESIGNED TO SATURATE AT LOW VOLTAGE AND CURRENT CONDITIONS, MEANS FOR PASSING CURRENT TO BE MONITORED THROUGH BOTH OF SAID PRIMARY WINDINGS, CIRCUIT MEANS FOR COMBINING ELECTRICAL QUANTITIES PROPORTIONAL TO VOLTAGES APPEARING ACROSS SAID SECONDARY WINDINGS IN OPPOSING RELATIONSHIP TO PRODUCE A SINGLE VOLTAGE PROPORTIONAL TO THE DIFFERENCE BETWEEN SAID FIRST-MENTIONED VOLTAGES, A CAPACITOR, MEANS FOR APPLYING SAID SINGLE VOLTAGE ACROSS SAID CAPACITOR, A UTILIZATION DEVICE, AND MEANS FOR DISCHARGING SAID CAPACITOR THROUGH THE UTILIZATION DEVICE WHEN THE VOLTAGE ACROSS SAID CAPACITOR REACHES A PREDETERMINED MAGNITUDE.
Claim 2
Dependent Claim
120 words
A TIME-OVERCURRENT RELAY COMPRISING A PAIR OF TRANSFORMERS EACH HAVING PRIMARY AND SECONDARY WINDINGS THEREON, ONE OF SAID TRANSFORMERS BEING DESIGNED TO SATURATE AT HIGH VOLTAGE AND CURRENT CONDITIONS AND THE OTHER TRANSFORMER BEING DESIGNED TO SATURATE AT LOW VOLTAGE AND CURRENT CONDITIONS, MEANS FOR PASSING CURRENT TO BE MONITORED THROUGH BOTH OF SAID PRIMARY WINDINGS, CIRCUIT MEANS FOR COMBINING ELECTRICAL QUANTITIES PROPORTIONAL TO VOLTAGES APPEARING ACROSS SAID SECONDARY WINDINGS IN OPPOSING RELATIONSHIP TO PRODUCE A SINGLE VOLTAGE PROPORTIONAL TO THE DIFFERENCE BETWEEN SAID FIRST-MENTIONED VOLTAGES, A CAPACITOR, MEANS FOR APPLYING SAID SINGLE VOLTAGE ACROSS SAID CAPACITOR, A UTILIZATION DEVICE, AND MEANS FOR DISCHARGING SAID CAPACITOR THROUGH THE UTILIZATION DEVICE WHEN THE VOLTAGE ACROSS SAID CAPACITOR REACHES A PREDETERMINED MAGNITUDE.
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) | 1970-04-03 | 1970-10-03 | 1971-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-03 | 1974-10-03 | 1975-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-03 | 1978-10-03 | 1979-04-04 | $7700.00 | Window Closed / Lapsed |