US3664776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable volume vane pump
Assignee: Continental Machines Inc
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Filing: 1970-08-17
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Granted: 1972-05-23
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Expires: 1990-08-17
Abstract
Abstract IN A SLIDING VANE PUMP HAVING END PLATES A ROTOR WITH ITS VANES AND A MOVABLE CAM RING WHICH ECCENTRICALLY SURROUNDS THE ROTOR DURING PUMPING. ONE OF THE END PLATES IS HYDRAULICALLY URGED TOWARD THE OTHER BY FLUID AT PUMP OUTLET PRESSURE EXERTED ON ITS OUTER SIDE AT A ZONE THEREOF AXIALLY OPPOSITE THE PUMP OUTLET ZONE. THE AREA ON WHICH SUCH FLUID EXERTS INWARD FORCE IS CRESCENT SHAPED, DEFINED BY TWO SEAL RINGS, ONE ENCIRCLING THE ROTOR SHAFT, THE OTHER LARGER AND ENCIRCLING THE SMALLER ONE.
Inventors
- 👤 Albert D Mills
- 👤 Walter F Ruhland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:03
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/18; F04C14/22; F04C14/223; F04C15/00; F04C15/0003; F04C15/0023
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |