Patent US4639197A successfully refreshed from Google Patents.
US4639197A
Expired / Lapsed
US
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Pump for cryogenic fluids
Assignee: Individual
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Filing: 1985-02-04
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Granted: 1987-01-27
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Expires: 2005-02-04
Abstract
Abstract The cryogenic pump operates in two stages, utilizing a supercharging part and a high pressure part. These two parts are comprised of a high pressure piston pump (3, 4, 34, 35) and a supercharger (5, 6, 61, 62) disposed in a tandem relationship and sharing a common piston rod (8). The supercharger is enclosed in a heat insulated intermediate container (7) and delivers the liquid cryogenic fluid to the high pressure cylinder. The pump operates to convey a liquid cryogenic fluid such as liquid nitrogen, for example, at a high pressure through evaporating means into pressure resistant commercial steel cylinders where the gaseous nitrogen is kept at a pressure of 200 bar and ambient temperature.
Inventors
- 👤 Jean Tornare
- 👤 Klaus Bofinger
- 👤 Claudio Tschopp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:51
CPC Classifications
F; F17; F17C; F17C5/00; F17C5/02; F04; F04B; F04B15/00; F04B15/06; F04B15/08; F04B3/00; F17C2221/00; F17C2221/01; F17C2221/014; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161; F17C2223/03; F17C2223/033; F17C2225/00; F17C2225/01; F17C2225/0107; F17C2225/0123; F17C2225/03; F17C2225/036; F17C2227/00; F17C2227/01; F17C2227/0128; F17C2227/0135; Y; Y10; Y10S; Y10S417/00; Y10S417/901
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
154 words
Pump for cryogenic fluids, having a high pressure part and a supercharger part, the high pressure part and the supercharger part each comprising a piston pump (3,4) (5,6) disposed in tandem and separated from one another by a partition (31) the pistons having a common piston rod (8) which slidably and sealingly extends through said partition, said partition being provided with an intake valve (33,34) the supercharger part being disposed in a heat insulated intermediate fluid container in sealing relationship with said partition, providing a sump for said supercharger part, said supercharger part comprising a cylinder (5) open at the intake side and a piston (6) provided with an intake valve (61,62) the supercharger cylinder (5) having a larger inside diameter than the high pressure cylinder (3), volume equilibrium being attained by an opening (51) provided at the highest point of said supercharger - cylinder, said opening emptying into the intermediate fluid container (7).
Claim 2
Dependent Claim
154 words
Pump for cryogenic fluids, having a high pressure part and a supercharger part, the high pressure part and the supercharger part each comprising a piston pump (3,4) (5,6) disposed in tandem and separated from one another by a partition (31) the pistons having a common piston rod (8) which slidably and sealingly extends through said partition, said partition being provided with an intake valve (33,34) the supercharger part being disposed in a heat insulated intermediate fluid container in sealing relationship with said partition, providing a sump for said supercharger part, said supercharger part comprising a cylinder (5) open at the intake side and a piston (6) provided with an intake valve (61,62) the supercharger cylinder (5) having a larger inside diameter than the high pressure cylinder (3), volume equilibrium being attained by an opening (51) provided at the highest point of said supercharger - cylinder, said opening emptying into the intermediate fluid container (7).
Claim 3
Dependent Claim
24 words
The pump according to claim 1 in which said partion (31) is provided with inlet openings (33) covered by an annular valve plate (34).
Claim 4
Dependent Claim
25 words
The pump according to claim 1 in which said supercharger piston (6) is provided with inlet openings (61) covered by an annular valve plate (62).
Claim 5
Dependent Claim
23 words
The pump according to claim 1 in which said intermediate container (7) having an inlet duct (72) is connected to a storage tank.
Claim 6
Dependent Claim
26 words
The pump according to claim 1 in which said high pressure cylinder has a spring loaded ball valve (35) leading to a high pressure duct (37).
Claim 7
Dependent Claim
32 words
The pump according to claim 1 in which said intermediate container (7) is provided at its highest point, when it is in an operative position with a closable gs discharge opening (74).
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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) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |