US2985801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical time-overcurrent protective relays
Assignee: English Electric Co Ltd
•
Filing: 1957-11-21
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Granted: 1961-05-23
•
Expires: 1977-11-21
Abstract
No abstract record available.
Inventors
- 👤 Warringto Albert Rus Cortlandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:20
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/08; H02H3/093; H01; H01H; H01H53/00; H01H53/10; H01H71/00; H01H71/10; H01H71/12; H01H71/42; H02H3/081
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE390280C
Cited
DE425121C
Cited
GB268532A
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US1792271A
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US1873950A
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US2432328A
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US2797369A
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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) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |