Patent US3587537A successfully refreshed from Google Patents.
US3587537A
Expired / Lapsed
US
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Temperature modulated variable speed drive
Assignee: Borg Warner Corp
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Filing: 1969-05-02
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Granted: 1971-06-28
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Expires: 1989-05-02
Abstract
Abstract A VARIABLE SPEED ACCESSORY DRIVE FOR A MOTOR VEHICLE EMPLOYS A WET-TYPE FRICTION CLUTCH HAVING FRICTION DISCS DISPOSED IN A LUBRICATING CIRCUIT FOR PROMOTING SLIPPING OF THE CLUTCH. THE CLUTCH IS URGED TOWARD DRIVING ENGAGEMENT BY A THERMALLY EXTENSIBLE TEMPERATURE SENSOR IN SERIES WITH A SPRING. THE UNIT MAY BE EMPLOYED TO DRIVE A COOLING FAN AT A SPEED PROPORTIONAL TO THE TEMPERATURE OF THE ENGINE COOLANT.
Inventors
- 👤 Romas B Spokas
- 👤 Grant H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:21
CPC Classifications
F; F01; F01P; F01P7/00; F01P7/02; F01P7/04; F01P7/08; F01P7/081; F01P7/082; F01P7/087
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |