Patent US2561967A successfully refreshed from Google Patents.
US2561967A
Expired / Lapsed
US
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Directional and overcurrent electrical relay
Assignee: Westinghouse Electric Corp
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Filing: 1947-06-19
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Granted: 1951-07-24
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Expires: 1967-06-19
Abstract
No abstract record available.
Inventors
- 👤 Royal C Bergvall
- 👤 Edwin L Harder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:30
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/08; H02H3/081
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1292585A
Cited
US1708789A
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US1745386A
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US1839467A
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US2001897A
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US2276675A
Cited
US2323776A
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US2474029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |