Patent US2830566A successfully refreshed from Google Patents.
US3303786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pumps
Assignee: FNRD Ltd
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Filing: 1966-04-22
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Granted: 1967-02-14
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Expires: 1986-04-22
Abstract
No abstract record available.
Inventors
- 👤 Fanshawe Hew Dalrymple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:57
CPC Classifications
F; F01; F01L; F01L25/00; F01L25/08; F01L23/00; F01L25/02; F01L25/04; F01L25/06; F01L25/063; F04; F04B; F04B11/00; F04B11/0008; F04B11/0033; F04B11/005; F04B11/0075; F04B43/00; F04B43/02; F04B43/06; F04B43/067; F04B9/00; F04B9/08; F04B9/10; F04B9/103; F04B9/107; F04B9/109; F04B9/111; F04B9/115; F04B9/117; Y; Y10; Y10S; Y10S417/00; Y10S417/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
245 words
A PUMPING ARRANGEMENT FOR PROVIDING CONTINUOUS DELIVERY STROKE IS EJECTED INTO THE MEDIUM DELIVERY LINE ONE HYDRAULICALLY-OPERATED PISTON-TYPE PUMP HAVING A MEDIUM INTAKE LINE, A MEDIUM DELIVERY LINE, A LINE FOR SUPPLYING HIGH PRESSURE LIQUID AND A LINE FOR DISCHARGING SAID LIQUID AT LOW PRESSURE, VALVE MEANS ASSOCIATED WITH SAID HIGH PRESSURE AND LOW PRESSURE LIQUID LINES FOR CAUSING ACTUATION OF THE PISTON OF SAID PUMP, A NON-RETURN VALVE IN THE MEDIUM DELIVERY LINE, AN ANCILLARY SYSTEM INCLUDING A BIASED PISTON MEANS, SAID PISTON MEANS BEING SUBJECT IN ONE DIRECTION TO THE PRESSURE OF THE MEDIUM IN THE DELIVERY LINE ON THE OUTLET SIDE OF SAID NON-RETURN VALVE AND SUBJECT IN THE OPPOSITE DIRECTION TO THE PRESSURE OF THE LIQUID IN SAID HIGH PRESSURE LIQUID SUPPLY LINE, AND MEANS FOR SO BIASING SAID ANCILLARY SYSTEM PISTON MEANS THAT THE PUMPED MEDIUM CAUSES MOVEMENT OF THE ANCILLARY SYSTEM PISTON MEANS AGAINST THE PRESSURE OF THE LIQUID IN THE HIGH PRESSURE LIQUID SUPPLY LINE AND THE PUMPED MEDIUM FLOWS INTO BOTH THE MEDIUM DELIVERY LINE AND THE ANCILLARY SYSTEM DURING THE DELIVERY STROKE OF THE PUMP PISTON, AND AT LEAST SOME OF THE PUMPED MEDIUM TAKEN INTO THE ANCILLARY SYSTEM DURING SAID DELIVERY STROKE IS EJECTED INTO THE MEDIUM DELIVERY LINE BY THE PRESSURE OF THE LIQUID IN THE HIGH PRESSURE LIQUID SUPPLY LINE DURING THE SUCTION STROKE OF THE PUMP PISTON, WHEREBY THE SUPPLY OF PUMPED MEDIUM TO THE MEDIUM DELIVERY LINE IS SUBSTANTIALLY CONTINUOUSLY MAINTAINED.
Claim 2
Dependent Claim
245 words
A PUMPING ARRANGEMENT FOR PROVIDING CONTINUOUS DELIVERY STROKE IS EJECTED INTO THE MEDIUM DELIVERY LINE ONE HYDRAULICALLY-OPERATED PISTON-TYPE PUMP HAVING A MEDIUM INTAKE LINE, A MEDIUM DELIVERY LINE, A LINE FOR SUPPLYING HIGH PRESSURE LIQUID AND A LINE FOR DISCHARGING SAID LIQUID AT LOW PRESSURE, VALVE MEANS ASSOCIATED WITH SAID HIGH PRESSURE AND LOW PRESSURE LIQUID LINES FOR CAUSING ACTUATION OF THE PISTON OF SAID PUMP, A NON-RETURN VALVE IN THE MEDIUM DELIVERY LINE, AN ANCILLARY SYSTEM INCLUDING A BIASED PISTON MEANS, SAID PISTON MEANS BEING SUBJECT IN ONE DIRECTION TO THE PRESSURE OF THE MEDIUM IN THE DELIVERY LINE ON THE OUTLET SIDE OF SAID NON-RETURN VALVE AND SUBJECT IN THE OPPOSITE DIRECTION TO THE PRESSURE OF THE LIQUID IN SAID HIGH PRESSURE LIQUID SUPPLY LINE, AND MEANS FOR SO BIASING SAID ANCILLARY SYSTEM PISTON MEANS THAT THE PUMPED MEDIUM CAUSES MOVEMENT OF THE ANCILLARY SYSTEM PISTON MEANS AGAINST THE PRESSURE OF THE LIQUID IN THE HIGH PRESSURE LIQUID SUPPLY LINE AND THE PUMPED MEDIUM FLOWS INTO BOTH THE MEDIUM DELIVERY LINE AND THE ANCILLARY SYSTEM DURING THE DELIVERY STROKE OF THE PUMP PISTON, AND AT LEAST SOME OF THE PUMPED MEDIUM TAKEN INTO THE ANCILLARY SYSTEM DURING SAID DELIVERY STROKE IS EJECTED INTO THE MEDIUM DELIVERY LINE BY THE PRESSURE OF THE LIQUID IN THE HIGH PRESSURE LIQUID SUPPLY LINE DURING THE SUCTION STROKE OF THE PUMP PISTON, WHEREBY THE SUPPLY OF PUMPED MEDIUM TO THE MEDIUM DELIVERY LINE IS SUBSTANTIALLY CONTINUOUSLY MAINTAINED.
References Cited (Backward Citations)
US2711697A
Cited
US3168045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |