US3146719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination pump and flow regulator
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1959-09-17
•
Granted: 1964-09-01
•
Expires: 1979-09-17
Abstract
No abstract record available.
Inventors
- 👤 Gilbert H Drutchas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:33
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/24; F04C14/26; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2579; Y10T137/2587; Y10T137/2605; Y10T137/2617; Y10T137/2713; Y10T137/2774; Y10T137/2802; Y10T137/2808
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
IN A PUMP FOR AN AUTOMOTIVE POWER ASSISTING SYSTEM COMPRISING A HOUSING HAVING AN INLET AND AN OUTLET AND A PUMPING CHAMBER THEREBETWEEN, A ROTOR IN SAID HOUSING HAVING A PERIPHERALLY NOTCHED SURFACE, SLIPPER MEANS CARRIED BY SAID ROTOR IN SAID PERIPHERALLY NOTCHED SURFACE, SAID SLIPPER MEANS BEING FREE TO ROCK AND TO RECIPROCATE IN THE NOTCHED PORTION OF THE ROTOR IN FOLLOWING THE CONTOUR OF AN ADJOINING BORE WALL PROVIDED BY THE PUMPING CHAMBER, THE IMPROVEMENT OF A LINEARLY MOVABLE SPOOL VALVE IN SAID PUMP OUTLET HAVING AN ORIFICE FORMED THEREIN THROUGH WHICH FLUID IS DISCHARGED UNDER PRESSURE BY SAID PUMP, BIASING MEANS TO LOAD THE VALVE CLOSED, SAID SPOOL VALVE HAVING LANDS AND RECESSES FORMED TO OPEN THE VALVE AGAINST THE BIASING MEANS TO BY-PASS EXCESS PUMP DISCHARGE TO SAID PUMP INLET AS A FUNCTION OF PUMP SPEED, AND MEANS ADDITIONALLY OPENING SAID SPOOL VALVE AS A FUNCTION OF THE LINEAR DISPLACEMENT OF SAID VALVE IN SAID PUMP OUTLET, THEREBY REDUCING BACK PRESSURE ON THE PUMP AT HIGHER OPERATING SPEEDS WHEN DEMAND IS SMALL.
Claim 2
Dependent Claim
176 words
IN A PUMP FOR AN AUTOMOTIVE POWER ASSISTING SYSTEM COMPRISING A HOUSING HAVING AN INLET AND AN OUTLET AND A PUMPING CHAMBER THEREBETWEEN, A ROTOR IN SAID HOUSING HAVING A PERIPHERALLY NOTCHED SURFACE, SLIPPER MEANS CARRIED BY SAID ROTOR IN SAID PERIPHERALLY NOTCHED SURFACE, SAID SLIPPER MEANS BEING FREE TO ROCK AND TO RECIPROCATE IN THE NOTCHED PORTION OF THE ROTOR IN FOLLOWING THE CONTOUR OF AN ADJOINING BORE WALL PROVIDED BY THE PUMPING CHAMBER, THE IMPROVEMENT OF A LINEARLY MOVABLE SPOOL VALVE IN SAID PUMP OUTLET HAVING AN ORIFICE FORMED THEREIN THROUGH WHICH FLUID IS DISCHARGED UNDER PRESSURE BY SAID PUMP, BIASING MEANS TO LOAD THE VALVE CLOSED, SAID SPOOL VALVE HAVING LANDS AND RECESSES FORMED TO OPEN THE VALVE AGAINST THE BIASING MEANS TO BY-PASS EXCESS PUMP DISCHARGE TO SAID PUMP INLET AS A FUNCTION OF PUMP SPEED, AND MEANS ADDITIONALLY OPENING SAID SPOOL VALVE AS A FUNCTION OF THE LINEAR DISPLACEMENT OF SAID VALVE IN SAID PUMP OUTLET, THEREBY REDUCING BACK PRESSURE ON THE PUMP AT HIGHER OPERATING SPEEDS WHEN DEMAND IS SMALL.
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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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |