US3252053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical protective relays
Assignee: English Electric Co Ltd
•
Filing: 1961-09-15
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Granted: 1966-05-17
•
Expires: 1981-09-15
Abstract
No abstract record available.
Inventors
- 👤 Paddison Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:50
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/02; H01; H01H; H01H53/00; H01H53/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A MOTOR-PATTERN ELECTRICAL PROTECTIVE RELAY COMPRISING A STATIONARY MAGNET HAVING TWO OPPOSED MAGNETIC POLES DEFINING BETWEEN THEN AN AIR GAP, A DISC-SHAPED ROTOR, MEANS FOR MOUNTING THE ROTOR FOR ROTATION ABOUT ITS CENTRAL TRANSVERSE AXIS AND WITH A PART OF THE ROTOR EXTENDING THROUGH THE AIR GAP, RESTORING SPRING MEANS FOR BIASING THE ROTOR TO A NON-OPERATIVE POSITION, ELECTRICAL DETECTING MEANS FOR DETECTING WHEN, ON ROTATION OF THE ROTOR FROM THE NON-OPERATIVE POSITION, THE ROTOR REACHED AN OPERATIVE POSITION AND AN ELECTRICAL WINDING CARRIED BY THE ROTOR FOR CAUSING THE ROTOR TO ROTATE FROM THE NON-OPERATIVE POSITION TO THE OPERATIVE POSITION WHEN THE WINDING IS ENERGISED BY A RELAY OPERATING CURRENT OF AT LEAST A PREDETERMINED MINIMUM MAGNITUDE, THE WINDING INCLUDING A PLURALITY OF SUBSTANTIALLY RADIAL TORQUE-PRODUCING CURRENT PATHS SPACED ANGULARLY AROUND THE ROTOR, AND A PLURALITY OF RETURN CURRENT PATHS CONNECTING THE TORQUE-PRODUCING CURRENT PATHS IN SERIES SO AS TO
Claim 2
Dependent Claim
151 words
A MOTOR-PATTERN ELECTRICAL PROTECTIVE RELAY COMPRISING A STATIONARY MAGNET HAVING TWO OPPOSED MAGNETIC POLES DEFINING BETWEEN THEN AN AIR GAP, A DISC-SHAPED ROTOR, MEANS FOR MOUNTING THE ROTOR FOR ROTATION ABOUT ITS CENTRAL TRANSVERSE AXIS AND WITH A PART OF THE ROTOR EXTENDING THROUGH THE AIR GAP, RESTORING SPRING MEANS FOR BIASING THE ROTOR TO A NON-OPERATIVE POSITION, ELECTRICAL DETECTING MEANS FOR DETECTING WHEN, ON ROTATION OF THE ROTOR FROM THE NON-OPERATIVE POSITION, THE ROTOR REACHED AN OPERATIVE POSITION AND AN ELECTRICAL WINDING CARRIED BY THE ROTOR FOR CAUSING THE ROTOR TO ROTATE FROM THE NON-OPERATIVE POSITION TO THE OPERATIVE POSITION WHEN THE WINDING IS ENERGISED BY A RELAY OPERATING CURRENT OF AT LEAST A PREDETERMINED MINIMUM MAGNITUDE, THE WINDING INCLUDING A PLURALITY OF SUBSTANTIALLY RADIAL TORQUE-PRODUCING CURRENT PATHS SPACED ANGULARLY AROUND THE ROTOR, AND A PLURALITY OF RETURN CURRENT PATHS CONNECTING THE TORQUE-PRODUCING CURRENT PATHS IN SERIES SO AS TO
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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) | 1969-05-16 | 1969-11-15 | 1970-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-16 | 1973-11-15 | 1974-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-16 | 1977-11-15 | 1978-05-17 | $7700.00 | Window Closed / Lapsed |