Patent US2818535A successfully refreshed from Google Patents.
US2818535A
Expired / Lapsed
US
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Safety control circuits for electric motors
Assignee: Westinghouse Electric Corp
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Filing: 1955-08-01
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Granted: 1957-12-31
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Expires: 1975-08-01
Abstract
No abstract record available.
Inventors
- 👤 Alfred E Skeats
- 👤 Gerald L Biehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:40
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02H7/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |