US2663809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor with a field responsive fluid clutch
Assignee: WEFCO Inc
•
Filing: 1949-01-07
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Granted: 1953-12-22
•
Expires: 1969-01-07
Abstract
No abstract record available.
Inventors
- 👤 Willis M Winslow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:05
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/10; H02K7/108; H02K7/1085; F; F16; F16D; F16D37/00; F16D37/008; F16D37/02; F16D2037/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US664190A
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US704574A
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US940698A
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US854709A
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US1988922A
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US1995605A
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US2012509A
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US2223210A
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US2289330A
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US2417850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |