US3559176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for locating faults in utility electrical power systems
Assignee: H B Engineering Corp
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Filing: 1966-11-25
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Granted: 1971-01-26
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Expires: 1986-11-25
Abstract
Abstract THE ELECTRICAL FAULT LOCATION METHOD AND SYSTEM PERTAINS TO THE MONITORING OF A DISTRIBUTION SYSTEM FOR CYCLICALLY VARYING POWER WITHIN A DETERMINED FREQUENCY RANGE. AN INTERROGATION FREQUENCY OF A GIVEN FREQUENCY IS MIXED IN A PASSIVE TRANSPONDER WITH A SECOND SIGNAL HAVING A FREQUENCY INDICATIVE OF THE POWER FREQUENCY AT A MONI- TORED POINT IN THE DISTRIBUTION SYSTEM. A FILTER RECEIVES AND PASSES THE MIXED FREQUENCY IF THE SECOND SIGNAL IS INDICATIVE OF A POWER FREQUENCY WITHIN THE DETERMINED FREQUENCY RANGE OF THE CYCLICALLY VARYING POWER FOR THE DISTRIBUTION SYSTEM.
Inventors
- 👤 Hugh M Baker Jr
- 👤 John R Cressey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:09
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/08; G01R31/081; G01R31/086; H; H02; H02J; H02J13/00; H02J13/13; H02J13/1321; H02J13/1325; H02J13/14; H02J2105/00; H02J2105/10; H02J2105/12; Y; Y02; Y02E; Y02E60/00; Y04; Y04S; Y04S40/00; Y04S40/12; Y04S40/124
Claims Analysis
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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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |