Patent US3457130A successfully refreshed from Google Patents.
Patent US3287993A successfully refreshed from Google Patents.
US3287993A
Expired / Lapsed
US
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Hydraulic piston pumps and motors
Assignee: Boulton Paul Aircraft Ltd
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Filing: 1965-01-04
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Granted: 1966-11-29
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Expires: 1985-01-04
Abstract
No abstract record available.
Inventors
- 👤 Lomnicki Zbigniew Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:38
CPC Classifications
F; F01; F01B; F01B1/00; F01B1/06; F01B1/0603; F01B1/0641; F01B1/0648; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
IN A MACHINE HAVING AT LEAST THREE PISTONS, THE IMPROVEMENT COMPRISING A TRACK MEMBER HAVING A CAM SURFACE IN DRIVING CONNECTION WITH EACH OF SAID PISTONS, SAID CAM SURFACE COMPRISING A PAIR OF HALF PERIPHERAL SECTIONS, ONE OF SAID HALF SECTIONS BEING A MIRROR IMAGE OF THE OTHER HALF SECTION, AND ONE HALF SECTION BEING SHAPED SUCH THAT, ASSUMING A MOTION OF EACH OF SAID PISTONS ALONG A PATH DETERMINED BY SAID CAM SURFACE, A POINT PASSING THROUGH THE CENTRAL LONGITUDINAL AXIS OF EACH OF SAID PISTONS WOULD HAVE AN AXIAL DISPLACEMENT F($) FROM THE MEDIAL POSITION OF TH E PISTON, WHERE $ IS THE RELATIVE DISPLACEMENT, HAVING ONE WORKING STROKE IN THE RANGE LYING BETWEEN 0 AND 2$, AND WHERE F($) IS DEFINED BY THE FOLLOWING CONDITIONS:
Claim 2
Dependent Claim
128 words
IN A MACHINE HAVING AT LEAST THREE PISTONS, THE IMPROVEMENT COMPRISING A TRACK MEMBER HAVING A CAM SURFACE IN DRIVING CONNECTION WITH EACH OF SAID PISTONS, SAID CAM SURFACE COMPRISING A PAIR OF HALF PERIPHERAL SECTIONS, ONE OF SAID HALF SECTIONS BEING A MIRROR IMAGE OF THE OTHER HALF SECTION, AND ONE HALF SECTION BEING SHAPED SUCH THAT, ASSUMING A MOTION OF EACH OF SAID PISTONS ALONG A PATH DETERMINED BY SAID CAM SURFACE, A POINT PASSING THROUGH THE CENTRAL LONGITUDINAL AXIS OF EACH OF SAID PISTONS WOULD HAVE AN AXIAL DISPLACEMENT F($) FROM THE MEDIAL POSITION OF TH E PISTON, WHERE $ IS THE RELATIVE DISPLACEMENT, HAVING ONE WORKING STROKE IN THE RANGE LYING BETWEEN 0 AND 2$, AND WHERE F($) IS DEFINED BY THE FOLLOWING CONDITIONS:
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |