US3320899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vane pumps and motors
Assignee: ZF Friedrichshafen AG
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Filing: 1965-08-10
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Granted: 1967-05-23
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Expires: 1985-08-10
Abstract
No abstract record available.
Inventors
- 👤 Thuengen Hubert Freiherr Von
- 👤 Doleschalek Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:45
CPC Classifications
F; F04; F04C; F04C15/00; F04C15/06; F04C15/062; F04C15/0042; F04C15/0049; F04C18/00; F04C18/30; F04C18/34; F04C18/344; F04C2/00; F04C2/30; F04C2/34; F04C2/344
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN A ROTARY VANE TYPE PUMP COMPRISING A CASING HAVING AN INLET AND AN OUTLET DUCT, A ROTOR IN SAID CASING COMPRISING ANGULARLY SPACED VANES EFFECTING CELLS FOR PUMPING FLUID FROM SAID INLET DUCT TO SAID OUTLET DUCT, WHEREIN THE DISPOSITION OF SAID ROTOR AND SAID VANES IN SAID CASING EFFECTS CLEARANCE SPACES IN SAID CASING AT GENERALLY OPPOSITE SIDES OF SAID CASING, SAID CLEARANCE SPACES BEING INTERMEDIATE SAID INLET AND OUTLET DUCTS AND BEING SUBJECTED TO OPPOSITELY VARYING PRESSURES AS SAID ROTOR ROTATES, THE IMPROVEMENT WHICH COMPRISES A FLOW BYPASS MEANS BETWEEN SAID CLEARANCE SPACES FOR EFFECTING COMMUNICATIONS OF FLUID THEREBETWEEN TO EQUALIZE PRESSURES IN SAID CLEARANCE SPACES, SAID BYPASS MEANS COMPRISING PORTS IN SAID CASING OPENING INTO RESPECTIVE CLEARANCE SPACES, AND A BYPASS TUBE MEANS CONNECTING THE PORTS,
Claim 2
Dependent Claim
130 words
IN A ROTARY VANE TYPE PUMP COMPRISING A CASING HAVING AN INLET AND AN OUTLET DUCT, A ROTOR IN SAID CASING COMPRISING ANGULARLY SPACED VANES EFFECTING CELLS FOR PUMPING FLUID FROM SAID INLET DUCT TO SAID OUTLET DUCT, WHEREIN THE DISPOSITION OF SAID ROTOR AND SAID VANES IN SAID CASING EFFECTS CLEARANCE SPACES IN SAID CASING AT GENERALLY OPPOSITE SIDES OF SAID CASING, SAID CLEARANCE SPACES BEING INTERMEDIATE SAID INLET AND OUTLET DUCTS AND BEING SUBJECTED TO OPPOSITELY VARYING PRESSURES AS SAID ROTOR ROTATES, THE IMPROVEMENT WHICH COMPRISES A FLOW BYPASS MEANS BETWEEN SAID CLEARANCE SPACES FOR EFFECTING COMMUNICATIONS OF FLUID THEREBETWEEN TO EQUALIZE PRESSURES IN SAID CLEARANCE SPACES, SAID BYPASS MEANS COMPRISING PORTS IN SAID CASING OPENING INTO RESPECTIVE CLEARANCE SPACES, AND A BYPASS TUBE MEANS CONNECTING THE PORTS,
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-22 | 1970-11-21 | 1971-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-22 | 1974-11-21 | 1975-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-22 | 1978-11-21 | 1979-05-23 | $7700.00 | Window Closed / Lapsed |