US3339489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pumps
Assignee: ZF International UK Ltd
•
Filing: 1965-05-25
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Granted: 1967-09-05
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Expires: 1985-05-25
Abstract
No abstract record available.
Inventors
- 👤 Mowbray Dorian Farrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:22
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/08; F04B23/00; F04B23/04; F04B23/08; F04B23/10; F04B23/106; F04B23/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
AN HYDRAULIC PUMP COMPRISING A BODY, A ROTOR MOUNTED WITHIN THE BODY, THE ROTOR HAVING A PLURALITY OF ANGULARLY SPACED BORES, PLUNGERS DISPOSED IN THE BORES RESPECTIVELY, THE BODY HAVING AN INLET AND AN OUTLET FOR HYDRAULIC FLUID, AN ANGULARLY ADJUSTABLE SWASH PLATE MOUNTED IN THE BODY AGAINST WHICH THE ENDS OF THE PLUNGERS ABUT, MEANS FOR ROTATING THE ROTOR SO THAT AS THE PLUNGERS RECIPROCATE BY CONTACT WITH THE SWASH PLATE, LIQUID IS PUMPED BETWEEN THE INLET AND THE OUTLET AND A PISTON AND CYLINDER TYPE SERVO MECHANISM FOR VARYING THE ANGLE OF THE SWASH PLATE IN ACCORDANCE WITH THE PRESSURE IN THE OUTLET, THE CYLINDER AT ONE SIDE OF THE PISTON BEING IN COMMUNICATION WITH THE OUTLET FROM THE PUMP, A SPRING ACTING BETWEEN THE OPPOSITE SIDE OF THE PISTON AND A FURTHER PISTON IN THE CYLINDER, AND A VALVE, THE POSITION OF WHICH
Claim 2
Dependent Claim
146 words
AN HYDRAULIC PUMP COMPRISING A BODY, A ROTOR MOUNTED WITHIN THE BODY, THE ROTOR HAVING A PLURALITY OF ANGULARLY SPACED BORES, PLUNGERS DISPOSED IN THE BORES RESPECTIVELY, THE BODY HAVING AN INLET AND AN OUTLET FOR HYDRAULIC FLUID, AN ANGULARLY ADJUSTABLE SWASH PLATE MOUNTED IN THE BODY AGAINST WHICH THE ENDS OF THE PLUNGERS ABUT, MEANS FOR ROTATING THE ROTOR SO THAT AS THE PLUNGERS RECIPROCATE BY CONTACT WITH THE SWASH PLATE, LIQUID IS PUMPED BETWEEN THE INLET AND THE OUTLET AND A PISTON AND CYLINDER TYPE SERVO MECHANISM FOR VARYING THE ANGLE OF THE SWASH PLATE IN ACCORDANCE WITH THE PRESSURE IN THE OUTLET, THE CYLINDER AT ONE SIDE OF THE PISTON BEING IN COMMUNICATION WITH THE OUTLET FROM THE PUMP, A SPRING ACTING BETWEEN THE OPPOSITE SIDE OF THE PISTON AND A FURTHER PISTON IN THE CYLINDER, AND A VALVE, THE POSITION OF WHICH
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) | 1970-09-04 | 1971-03-06 | 1971-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-04 | 1975-03-06 | 1975-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-04 | 1979-03-06 | 1979-09-05 | $7700.00 | Window Closed / Lapsed |