Patent US2851646A successfully refreshed from Google Patents.
US2851646A
Expired / Lapsed
US
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Reversing relay for electric motors
Assignee: Westinghouse Electric Corp
•
Filing: 1956-03-07
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Granted: 1958-09-09
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Expires: 1976-03-07
Abstract
No abstract record available.
Inventors
- 👤 John S Williamson
- 👤 Knud J Helsing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:00
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/02; H01H51/04; H01H51/18; H01H13/00; H01H13/50; H01H13/56; H01H13/58; H01H51/06; H01H51/08; H01H51/082; H01H51/084; B; B02; B02C; B02C18/00; B02C18/06; B02C18/16; B02C2018/164
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1239114A
Cited
US1644171A
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US1824973A
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US1766600A
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US1732577A
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US2528520A
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US2701855A
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US2762004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |