Patent US3074345A successfully refreshed from Google Patents.
US3074345A
Expired / Lapsed
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Hydraulic pump
Assignee: Pneumo Dynamics Corp
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Filing: 1959-07-27
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Granted: 1963-01-22
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Expires: 1979-07-27
Abstract
No abstract record available.
Inventors
- 👤 Scheflow Oliver Waller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:54
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/26; F04B1/28; F04B1/14; F04B1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
A HYDRAULIC MECHANISM COMPRISING A BODY, A ROTARY SHAFT ROTATABLY MOUNTED IN SAID BODY, A PLURALITY OF CYLINDERS HAVING THEIR LONGITUDINAL AXES ARRANGED IN PARALLEL RELATION, A PISTON RECIPROCABLE IN EACH CYLINDER, MEANS MOUNTED ON THE SHAFT AND ENGAGING THE PISTONS PRODUCING RECIPROCATION OF SAID PISTONS UPON ROTATION OF SAID SHAFT, A PORT OPEN TO EACH CYLINDER SYMMETRICALLY POSITIONED AT EQUAL DISTANCE FROM THE AXIS OF SAID SHAFT, A MEMBER CONCENTRICALLY MOUNTED ON SAID SHAFT FOR ROTATION THEREWITH HAVING A BEARING SURFACE ECCENTRIC RELATIVE TO SAID SHAFT, AN ANNULAR VALVE JOURNALLED ON SAID BEARING SURFACE AND ABUTTING ADJACENT ENDS OF THE CYLINDERS, SEPARATE HIGH AND LOW PRESSURE ZONES LEADING TO SAID VALVE WITH ONE PORTION OF THE VALVE FORMING A BOUNDING SURFACE OF THE HIGH PRESSURE ZONE AND ANOTHER PORTION OF THE VALVE FORMING A BOUNDING SURFACE OF THE LOW PRESSURE ZONE, SAID VALVE BY VIRTUE OF ROTATION OF SAID MEMBER PROGRESSIVELY CONNECTING SAID CYLINDERS TO SAID LOW AND HIGH PRESSURE ZONES, AND MEANS ENGAGING SAID MEMBER AND SHAFT RESPONSIVE TO PRESSURE VARIATIONS WITHIN SAID
Claim 2
Dependent Claim
175 words
A HYDRAULIC MECHANISM COMPRISING A BODY, A ROTARY SHAFT ROTATABLY MOUNTED IN SAID BODY, A PLURALITY OF CYLINDERS HAVING THEIR LONGITUDINAL AXES ARRANGED IN PARALLEL RELATION, A PISTON RECIPROCABLE IN EACH CYLINDER, MEANS MOUNTED ON THE SHAFT AND ENGAGING THE PISTONS PRODUCING RECIPROCATION OF SAID PISTONS UPON ROTATION OF SAID SHAFT, A PORT OPEN TO EACH CYLINDER SYMMETRICALLY POSITIONED AT EQUAL DISTANCE FROM THE AXIS OF SAID SHAFT, A MEMBER CONCENTRICALLY MOUNTED ON SAID SHAFT FOR ROTATION THEREWITH HAVING A BEARING SURFACE ECCENTRIC RELATIVE TO SAID SHAFT, AN ANNULAR VALVE JOURNALLED ON SAID BEARING SURFACE AND ABUTTING ADJACENT ENDS OF THE CYLINDERS, SEPARATE HIGH AND LOW PRESSURE ZONES LEADING TO SAID VALVE WITH ONE PORTION OF THE VALVE FORMING A BOUNDING SURFACE OF THE HIGH PRESSURE ZONE AND ANOTHER PORTION OF THE VALVE FORMING A BOUNDING SURFACE OF THE LOW PRESSURE ZONE, SAID VALVE BY VIRTUE OF ROTATION OF SAID MEMBER PROGRESSIVELY CONNECTING SAID CYLINDERS TO SAID LOW AND HIGH PRESSURE ZONES, AND MEANS ENGAGING SAID MEMBER AND SHAFT RESPONSIVE TO PRESSURE VARIATIONS WITHIN SAID
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |