US3309995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid pumping apparatus
Assignee: Dowty Fuel Systems Ltd
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Filing: 1965-02-25
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Granted: 1967-03-21
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Expires: 1985-02-25
Abstract
No abstract record available.
Inventors
- 👤 Stanley R Tyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:56
CPC Classifications
F; F15; F15B; F15B1/00; F02; F02C; F02C7/00; F02C7/22; F02C7/236; F04; F04D; F04D13/00; F04D13/12; F04D15/00; F04D15/0005; F04D15/0022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
PUMPING APPARATUS COMPRISING A CENTRIFUGAL PUMP HAVING AN INLET ARRANGED FOR CONNECTION WITH A SOURCE OF LIQUID, A VALVE IN THE INLET, FLOW CONTROL MEANS OPERABLE UPON SAID INLET VALVE TO CONTROL THE FLOW OF LIQUID INTO THE CENTRIFUGAL PUMP SUCH THAT THE LIQUID THEREIN FORMS, WHEN THE PUMP IS DRIVEN, AN ANNULUS WHOSE RADIAL DEPTH CONTROLS THE PUMP OUTLET PRESSURE, POSITIVE DISPLACEMENT PUMP MEANS CONNECTED TO THE OUTLET OF THE CENTRIFUGAL PUMP AND HAVING AN OUTLET FOR CONNECTION WITH A LOAD AT PRESSURE, SAID PUMP MEANS INCLUDING FLOW-REGULATING MEANS OPERABLE TO VARY THE EFFECTIVE DELIVERY OF SAID PUMP MEANS WHEN THE MAXIMUM DELIVERY OF WHICH SAID PUMP MEANS IS CAPABLE AT A GIVEN PUMP SPEED EXCEEDS THE CONTROLLED LIQUID FLOW THROUGH THE CENTRIFUGAL PUMP AND A MOVABLE CONTROL MEMBER OF SAID FLOW-REGULATING MEANS RESPONSIVE TO THE FLUID PRESSURE ACROSS THE LIQUID ANNULUS IN THE CENTRIFUGAL PUMP.
Claim 2
Dependent Claim
147 words
PUMPING APPARATUS COMPRISING A CENTRIFUGAL PUMP HAVING AN INLET ARRANGED FOR CONNECTION WITH A SOURCE OF LIQUID, A VALVE IN THE INLET, FLOW CONTROL MEANS OPERABLE UPON SAID INLET VALVE TO CONTROL THE FLOW OF LIQUID INTO THE CENTRIFUGAL PUMP SUCH THAT THE LIQUID THEREIN FORMS, WHEN THE PUMP IS DRIVEN, AN ANNULUS WHOSE RADIAL DEPTH CONTROLS THE PUMP OUTLET PRESSURE, POSITIVE DISPLACEMENT PUMP MEANS CONNECTED TO THE OUTLET OF THE CENTRIFUGAL PUMP AND HAVING AN OUTLET FOR CONNECTION WITH A LOAD AT PRESSURE, SAID PUMP MEANS INCLUDING FLOW-REGULATING MEANS OPERABLE TO VARY THE EFFECTIVE DELIVERY OF SAID PUMP MEANS WHEN THE MAXIMUM DELIVERY OF WHICH SAID PUMP MEANS IS CAPABLE AT A GIVEN PUMP SPEED EXCEEDS THE CONTROLLED LIQUID FLOW THROUGH THE CENTRIFUGAL PUMP AND A MOVABLE CONTROL MEMBER OF SAID FLOW-REGULATING MEANS RESPONSIVE TO THE FLUID PRESSURE ACROSS THE LIQUID ANNULUS IN THE CENTRIFUGAL PUMP.
References Cited (Backward Citations)
US3043367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |