Patent US3294976A successfully refreshed from Google Patents.
US3294976A
Expired / Lapsed
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Unbalanced load detection in alternating current systems
Assignee: Westinghouse Electric Corp
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Filing: 1964-02-27
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Granted: 1966-12-27
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Expires: 1984-02-27
Abstract
No abstract record available.
Inventors
- 👤 Lynn L Tipton
- 👤 James F Heins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:11
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/06; H02H7/062
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN A SYSTEM INCLUDING A PLURALITY OF POLYPHASE ALTERNATING CURRENT POWER SOURCES OPERATING IN PARALLEL, MEANS FOR PRODUCING A SIGNAL CURRENT PROPORTIONAL TO THE DIFFERENCE IN LOAD CURRENTS OF SAID POWER SOURCES, AND A VOLTAGE SENSING CIRCUIT FOR EACH POWER SOURCE, EACH OF SAID VOLTAGE SENSING CIRCUITS INCLUDING MEANS FOR DERIVING A PLURALITY OF VOLTAGES FROM SAID SIGNAL CURRENT HAVING PREDETERMINED PHASE RELATIONS THERETO, AND MEANS FOR COMBINING SAID DERIVED VOLTAGES WITH THE PHASE VOLTAGES OF THE POWER SOURCE TO ADD VECTORIALLY THERETO.
Claim 2
Dependent Claim
83 words
IN A SYSTEM INCLUDING A PLURALITY OF POLYPHASE ALTERNATING CURRENT POWER SOURCES OPERATING IN PARALLEL, MEANS FOR PRODUCING A SIGNAL CURRENT PROPORTIONAL TO THE DIFFERENCE IN LOAD CURRENTS OF SAID POWER SOURCES, AND A VOLTAGE SENSING CIRCUIT FOR EACH POWER SOURCE, EACH OF SAID VOLTAGE SENSING CIRCUITS INCLUDING MEANS FOR DERIVING A PLURALITY OF VOLTAGES FROM SAID SIGNAL CURRENT HAVING PREDETERMINED PHASE RELATIONS THERETO, AND MEANS FOR COMBINING SAID DERIVED VOLTAGES WITH THE PHASE VOLTAGES OF THE POWER SOURCE TO ADD VECTORIALLY THERETO.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |