US3379933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical protective relays
Assignee: English Electric Co Ltd
•
Filing: 1964-12-21
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Granted: 1968-04-23
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Expires: 1984-12-21
Abstract
No abstract record available.
Inventors
- 👤 Hoel Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:12
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/26; H02H7/261; H02H7/262; H02H7/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A PROTECTIVE RELAY ARRANGEMENT FOR PROTECTING AN ELECTRICAL SYSTEM, COMPRISING FIRST AND SECOND ELECTRICAL RELAYS SPACED APART FROM ONE ANOTHER WITHIN SAID SYSTEM, SAID FIRST RELAY COMPRISING TWO ELEMENTS FOR RECEIVING AN INPUT SIGNAL INDICATIVE OF CONDITIONS IN SAID ELECTRICAL SYSTEM, ONE SAID ELEMENT BEING OPERABLE TO DEVELOP AN OUTPUT SIGNAL UPON THE INPUT BEING INDICATIVE OF A FAULT OCCURRING WITHIN A FIRST DISTANCE EXTENDING UNIDIRECTIONALLY FROM SAID FIRST RELAY AND OVERLAPPING A SECTION OF SAID SYSTEM EXTENDING BETWEEN THE FIRST AND SECOND RELAYS, THE OTHER ELEMENT BEING OPERABLE TO DEVELOP AN OUTPUT SIGNAL UPON THE INPUT BEING INDICATIVE OF A FAULT OCCURRING WITHIN A SECOND DISTANCE CONSISTING OF A FIRST ZONE EMBRACING A FIRST PART OF THE FIRST DISTANCE WITHIN SAID SECTION AND ANOTHER ZONE EXTENDING IN THE OPPOSITE DIRECTION FROM THE RELAY, AND
Claim 2
Dependent Claim
135 words
A PROTECTIVE RELAY ARRANGEMENT FOR PROTECTING AN ELECTRICAL SYSTEM, COMPRISING FIRST AND SECOND ELECTRICAL RELAYS SPACED APART FROM ONE ANOTHER WITHIN SAID SYSTEM, SAID FIRST RELAY COMPRISING TWO ELEMENTS FOR RECEIVING AN INPUT SIGNAL INDICATIVE OF CONDITIONS IN SAID ELECTRICAL SYSTEM, ONE SAID ELEMENT BEING OPERABLE TO DEVELOP AN OUTPUT SIGNAL UPON THE INPUT BEING INDICATIVE OF A FAULT OCCURRING WITHIN A FIRST DISTANCE EXTENDING UNIDIRECTIONALLY FROM SAID FIRST RELAY AND OVERLAPPING A SECTION OF SAID SYSTEM EXTENDING BETWEEN THE FIRST AND SECOND RELAYS, THE OTHER ELEMENT BEING OPERABLE TO DEVELOP AN OUTPUT SIGNAL UPON THE INPUT BEING INDICATIVE OF A FAULT OCCURRING WITHIN A SECOND DISTANCE CONSISTING OF A FIRST ZONE EMBRACING A FIRST PART OF THE FIRST DISTANCE WITHIN SAID SECTION AND ANOTHER ZONE EXTENDING IN THE OPPOSITE DIRECTION FROM THE RELAY, AND
References Cited (Backward Citations)
US2897406A
Cited
US3201651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |