Patent US3090313A successfully refreshed from Google Patents.
US3090313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable displacement pump
Assignee: Weatherhead Co
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Filing: 1961-04-25
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Granted: 1963-05-21
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Expires: 1981-04-25
Abstract
No abstract record available.
Inventors
- 👤 Budzich Tadeusz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:59
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/22; F04B49/225; F04B1/00; F04B1/12; F04B1/14; F04B1/141; F04B1/143; F04B49/08; F04B49/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
A PUMP COMPRISING A PUMP HOUSING PROVIDING A FLUID CHAMBER THEREIN, AN INLET PORT TO SAID FLUID CHAMBER, AN OUTLET PORT ON SAID PUMP HOUSING, A CYLINDER BLOCK MOUNTED FOR SLIDABLE MOVEMENT WITHIN SAID FLUID CHAMBER ALONG A LONGITUDINAL AXIS, A PLURALITY OF CYLINDER BORES IN SAID CYLINDER BLOCK, A PISTON WITHIN EACH OF SAID CYLINDER BORES, MEANS IN SAID PUMP HOUSING TO PROGRESSIVELY RECIPROCATE SAID PISTONS IN SAID CYLINDER BORES BETWEEN FORWARD AND RETRACTED POSITIONS, MEANS CONNECTING EACH OF SAID CYLINDER BORES TO SAID OUTLET PORT, AN INLET PORT FOR EACH CYLINDER BORE IN SAID CYLINDER BLOCK, SAID PORT HAVING AXIALLY SPACED EDGES, SAID CYLINDER BLOCK DEFINING A MAXIMUM VOLUME POSITION WHEN THE PISTON HEAD IS INTERMEDIATE SAID PORT EDGES WHEN THE PISTON IS IN THE RETRACTED POSITION, MEANS TO SHIFT SAID CYLINDER BLOCK IN ONE DIRECTION FROM SAID MAXIMUM VOLUME POSITION TO REDUCE THE EFFECTIVE AREA OF SAID CYLINDER BORE INLET PORTS, AND MEANS TO SHIFT SAID CYLINDER BLOCK IN THE OLTHER DIRECTION FROM SAID MAXIMUM VOLUME POSITION TO REDUCE THE EFFECTIVE LENGTH OF THE PUMPING STROKE OF THE PISTONS.
Claim 2
Dependent Claim
182 words
A PUMP COMPRISING A PUMP HOUSING PROVIDING A FLUID CHAMBER THEREIN, AN INLET PORT TO SAID FLUID CHAMBER, AN OUTLET PORT ON SAID PUMP HOUSING, A CYLINDER BLOCK MOUNTED FOR SLIDABLE MOVEMENT WITHIN SAID FLUID CHAMBER ALONG A LONGITUDINAL AXIS, A PLURALITY OF CYLINDER BORES IN SAID CYLINDER BLOCK, A PISTON WITHIN EACH OF SAID CYLINDER BORES, MEANS IN SAID PUMP HOUSING TO PROGRESSIVELY RECIPROCATE SAID PISTONS IN SAID CYLINDER BORES BETWEEN FORWARD AND RETRACTED POSITIONS, MEANS CONNECTING EACH OF SAID CYLINDER BORES TO SAID OUTLET PORT, AN INLET PORT FOR EACH CYLINDER BORE IN SAID CYLINDER BLOCK, SAID PORT HAVING AXIALLY SPACED EDGES, SAID CYLINDER BLOCK DEFINING A MAXIMUM VOLUME POSITION WHEN THE PISTON HEAD IS INTERMEDIATE SAID PORT EDGES WHEN THE PISTON IS IN THE RETRACTED POSITION, MEANS TO SHIFT SAID CYLINDER BLOCK IN ONE DIRECTION FROM SAID MAXIMUM VOLUME POSITION TO REDUCE THE EFFECTIVE AREA OF SAID CYLINDER BORE INLET PORTS, AND MEANS TO SHIFT SAID CYLINDER BLOCK IN THE OLTHER DIRECTION FROM SAID MAXIMUM VOLUME POSITION TO REDUCE THE EFFECTIVE LENGTH OF THE PUMPING STROKE OF THE PISTONS.
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) | 1966-05-20 | 1966-11-19 | 1967-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-20 | 1970-11-19 | 1971-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-20 | 1974-11-19 | 1975-05-21 | $7700.00 | Window Closed / Lapsed |