US3621822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction motor driven cooling fan
Assignee: Ford Motor Co
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Filing: 1970-05-20
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Granted: 1971-11-23
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Expires: 1990-05-20
Abstract
Abstract THIS INVENTION RELATES TO AN INTERNAL COMBUSTION ENGINE SYSTEM IN WHICH THE COOLING FAN IS DRIVEN BY AN INDUCTION ELECTRIC MOTOR RATHER THAN MECHANICALLY BY THE ENGINE. THIS INDUCTION MOTOR IS A POLY PHASE INDUCTION MOTOR AND IS DRIVEN BY DIRECT ELECTRICAL CONNECTION TO THE ALTERNATOR WHICH NORMALLY SUPPLIES ELECTRIC POWER TO VEHICULAR COMPONENTS. THE INDUCTION MOTOR INCLUDES SQUIRREL CAGE ROTOR CONDUCTORS MOUNTED ON THE ROTOR AND DEEPLY BURIED IN THE ROTOR TO ENHANCE THE REACTIVITY OF THE MOTOR AT HIGH SLIPS.
Inventors
- 👤 Thomas H Oster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:52
CPC Classifications
F; F01; F01P; F01P7/00; F01P7/02; F01P7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |