US3565558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary pump with sliding vanes
Assignee: Airborne Manufacturing Co
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Filing: 1969-01-31
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Granted: 1971-02-23
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Expires: 1989-01-31
Abstract
Abstract A ROTARY PUMP HAVING SLIDING VANES CARRIED IN AXIALLY EXTENDING SLOTS IN A ROTOR WHICH TURNS IN A TWO LOBE STATOR. THE SURFACE OF EACH LOBE HAS SEQUENTIAL SEGMENTS CONTOURED TO ACHIEVE MAXIMUM VOLUMETRIC DISPLACEMENT WITHIN A RELATIVELY SMALL STATOR AND ALSO TO MINIMIZE THE STRESSES OCCURING IN THE VANES AND ROTOR DURING VANE EXTENSION AND RETRACTION WHILE MOVING CIRCUMFERENTIALLY AROUND A LOBE SURFACE TO REDUCE WEAR AND TO EXTEND PUMP LIFE. THE PUMP CONSTRUCTION PERMITS ASSEMBLY AND SECURING OF THE END PLATES AND OTHER COMPONENTS OF THE PUMP USING ONLY TWO THREADED FASTENERS TURNED INTO DIAMETRICALLY OPPOSITE AXIALLY EXTENDING OPENINGS IN THE STATOR WALL.
Inventors
- 👤 Leo Tobacman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:37
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/30; F04C2/34; F04C2/344; F04C2/3446; F01; F01C; F01C21/00; F01C21/10
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |