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| Number | Title | Issue Date |
| 7393186 | Multi-stage compressor A multi-stage compressor is disclosed, which comprises: two motion converters driven by one driving shaft and converting a rotary motion to a straight-line reciprocating motion; first and second pistons (62) connected to one of the motion converters in opposi... | 07/01/2008 |
| 7383967 | Apparatus and methods for pumping high viscosity fluids A system for dispensing and filtering fluid is disclosed, in which the fluid flow path is substantially vertical from the fluid inlet through fluid dispense. Substantially all wetted surfaces are Teflon® or some similar non-contaminating fluid, for applications suc... | 06/10/2008 |
| 7377312 | Oil well pump apparatus An oil well pumping apparatus for pumping oil from a well to a wellhead provides a tool body that is sized and shaped to be lowered into the production tubing string of the oil well. A working fluid is provided that can be pumped into the production tubing. A prime ... | 05/27/2008 |
| 7311502 | Method for using a hydraulic amplifier pump in ultrahigh pressure liquid chromatography A method for supplying solvent to an ultra-high pressure liquid chromatography system using a hydraulic amplifier. The hydraulic amplifier system includes a hydraulic cylinder comprising a primary piston chamber in which a primary piston is disposed and a secondary ... | 12/25/2007 |
| 7275592 | Oil well pump apparatus An oil well pumping apparatus for pumping oil from a well to a wellhead provides a tool body that is sized and shaped to be lowered into the production tubing string of the oil well. A working fluid is provided that can be pumped into the production tubing. A prime ... | 10/02/2007 |
| 7242106 | Method of operation for a self-protecting wave energy conversion plant A wavefarm (10) comprises a multiplicity of wave energy converters, comprising linear generators (19, 20, 21) and (22) which are driven by floats immersed in the sea, (14). In normal wave conditions, all of the generators supply a land li... | 07/10/2007 |
| 7083395 | Pump system for pumping liquefied gases Under one aspect of the present invention, a liquefied gas pump assembly is coupleable to a source of liquefied gas. A cooling assembly is positioned generally adjacent to a pump module. The cooling assembly has a converging pump-head-receiving aperture, a fluid inl... | 08/01/2006 |
| 7063513 | Liquid chromatograph pump with dual cylinders and dual plungers In a pump for feeding a liquid for chromatography, first and second plungers form first and second volumes respectively together with first and second chambers, the first plunger is prevented from changing the first volume sufficiently for feeding the liquid between... | 06/20/2006 |
| 7063785 | Pump for liquid chromatography The invention provides a pump for liquid chromatography excellent in feeding liquid stably at an extremely low flow rate with high accuracy and in discharging bubbles at startup. At startup, a first plunger feeds solvent at a large flow rate to discharge bubb... | 06/20/2006 |
| 6997683 | High pressure reciprocating pump and control of the same Pumping for chromatograph applications calls for constant flow at high pressures and for accurate control of liquid composition. A two-cylinder pump, and associated controls provide an accurate, fixed flow rate. During the initial portion of the pumping stroke of a ... | 02/14/2006 |
| 6973922 | Fuel supply control system for engine A composite control valve is constructed by a valve housing, first and second diaphragms mounted to the valve housing and disposed to be opposed to each other, a negative pressure working chamber defined between the first and second diaphragms to communicate with a ... | 12/13/2005 |
| 6558135 | Two stage oil free air compressor A two stage reciprocating piston oil free air compressor having an improved service interval. In a first stage, a first wobble piston is reciprocated in a first cylinder to compress ambient air to an intermediate pressure. In a second stage a second wobbl... | 05/06/2003 |
| 6558134 | Fluid intensifier pump system An intensifier pump system includes a supply pump for delivering fluid products at an intermediate pressure. The products are delivered to one or more intensifier pumps that take advantage of hydraulic intensification to expel the product at high pressure... | 05/06/2003 |
| 6450772 | Compact molecular drag vacuum pump A molecular drag vacuum pump configured for pumping a gas stream from an inlet to an outlet, the pump including a high-speed spinning disk having a channel formed in its edge, disposed within a housing. A passageway is formed on the inside of the housing ... | 09/17/2002 |
| 6422838 | Two-stage, permanent-magnet, integral disk-motor pump A two-stage, permanent-magnet, integral disk-motor centrifugal pump, has a housing having first and second suction ports and first and second discharge ports, the first discharge port being connected to the second suction port. A first impeller is rotatab... | 07/23/2002 |
| 6183211 | Two stage oil free air compressor A two stage reciprocating piston oil free air compressor having an improved service interval. In a first stage, a first wobble piston is reciprocated in a first cylinder to compress ambient air to an intermediate pressure. In a second stage a second wobbl... | 02/06/2001 |
| 6158972 | Two stage pulse pump A fluid actuated fuel pump assembly including a body 12 having saucer-like sections 54 defining separate concave inlet 14 and outlet 16 hollows and a cylindrical central section 52 defining a fuel intake passage 48 for admitting fuel and extending in the ... | 12/12/2000 |
| 5755561 | Piston pumping system delivering fluids with a substantially constant flow rate A pumping system in accordance with the invention comprises n (nࣙ1) piston or diaphragm primary pumping modules (P1 to Pn) including each at least one pumping unit, connected by means of unidirectional valves (V11-V1n) respectively to n tanks (R1-Rn) co... | 05/26/1998 |
| 5049038 | Fluid compressors A two stage fluid compressor is operated by a pneumatically operated relay valve controlled by a fluidic switching device in which switching pulses of pressurized control air are obtained automatically on movement of a compression piston in one of the com... | 09/17/1991 |
| 5020974 | Fluid compressors A fluid compressor includes a plurality of compression stages each operated sequentially by drive means comprising a pneumatically operated drive piston operating in a drive cylinder. Several embodiments are described and illustrated having different form... | 06/04/1991 |
| 4784579 | Hydraulic-pneumatic power transfer unit Disclosed herein is a hydraulic to pneumatic power transfer unit which converts a high pressure oil flow into a flow of high pressure air by means of three stages of piston pumps and characterized by a first stage having a pair of linked pistons of substa... | 11/15/1988 |
| 4714411 | Fluid pressure intensifier device A fluid pressure intensifier device particularly suited for intensifying the pressure of a gas has a plurality of piston and cylinder compression stages of sequentially reducing volume connected by flow passages (FIG. 5b) for conducting fluid to be pressu... | 12/22/1987 |
| 4679986 | Energy conserving refrigeration apparatus and method An energy-conserving refrigeration apparatus which employs a atmospheric pressure and vacuum-pressure actuated partial compressor for a refrigerant gas in combination with a conventional prime mover-driven compressor and also achieves lower compressor hea... | 07/14/1987 |
| 4600365 | Displacement pump for low-pulsation delivery of a liquid A low-pulsation displacement pump comprises two series-connected cylinders which are controlled by valves so that the delivery takes place only in one direction. The pistons of the cylinders are controlled through cams which are driven jointly at a consta... | 07/15/1986 |
| 4093403 | Multistage fluid-actuated diaphragm pump with amplified suction capability Disclosed herein is a fluid-actuated, diaphragm pump which is particularly adaptable for use as a fuel pump for a multi-cylinder, two-cycle internal combustion engine and which includes an inlet chamber, an outlet chamber, a first diaphragm separating the... | 06/06/1978 |
| 4003679 | High pressure pump with metering A pumping system is provided in which a low pressure metering pump injects fluid charges into a high pressure pump which in turn operates into a high pressure load. The high pressure pump is designed to always present a low pressure at its input on its in... | 01/18/1977 |
