Patents
Sitemap › F04 - Positive-displacement machines for liquids; Pumps for liquids or elastic fluids › F04B - Positive-displacement machines for liquids; Pumps › F04B 5 - Machines or pumps with differential-surface pistons
Patents for F04B 5 - Machines or pumps with differential-surface pistons (514)
02/1995
02/22/1995EP0639713A1 Plunger pump
01/1995
01/10/1995US5380428 Pump for reverse osmosis system
01/10/1995US5380175 Fluid feed pump with valved piston device
01/04/1995EP0632403A2 Handwritten symbol recognizer
12/1994
12/31/1994CA2125312A1 Handwritten symbol recognizer
12/28/1994EP0631050A1 Pump
12/20/1994US5374168 Reciprocating piston fluid pump
11/1994
11/24/1994WO1994020753A3 Cyclic hydraulic pump
11/24/1994DE4316986A1 Piston pump
09/1994
09/15/1994WO1994020753A2 Cyclic hydraulic pump
09/15/1994CA2157906A1 Cyclic hydraulic pump
04/1994
04/27/1994EP0593645A1 Quick-change fluid section for piston-type paint pumps
03/1994
03/22/1994US5295809 Valved piston pump with cylinder biasing means
03/01/1994US5290159 Downhole pump of constant differential hydraulic pressure
12/1993
12/29/1993EP0576133A1 Gas compressors
12/29/1993CN1080027A 气体压缩机 Gas compressor
10/1993
10/28/1993WO1993020928A1 Pump for reverse osmosis system
10/26/1993US5255828 Liquid developer supply system with pump for discharging fixed amounts of liquid developer
10/12/1993US5252033 Portable car-used oil extracting and tire inflation apparatus
09/1993
09/14/1993US5244364 Pumping unit
09/14/1993US5244361 Pump for reverse osmosis system
08/1993
08/17/1993US5236008 Sealing ring carrier and valve support
07/1993
07/20/1993US5228842 Quick-change fluid section for piston-type paint pumps
05/1993
05/11/1993US5209647 Straight cylinder gas compressor with a reduced diameter compression chamber
04/1993
04/06/1993CA1315598C2 Booster pump, particularly for reverse osmosis systems
03/1993
03/16/1993US5193988 Reverse osmosis system and automatic cycling booster pump therefor
02/1993
02/24/1993EP0528714A1 Gas booster
02/18/1993WO1993003279A1 Quick-change fluid section for piston-type paint pumps
10/1992
10/20/1992US5156537 Multiphase fluid mass transfer pump
10/14/1992CN2118831U Inner conductive differencial compressor
10/13/1992US5154820 Reverse osmosis system with cycled pressure intensifiers
08/1992
08/19/1992EP0498981A1 Gas compressor
07/1992
07/30/1992DE4102364A1 Piston pump unit - has stepped piston forming two working chambers
12/1991
12/27/1991EP0462386A1 Dual-acting, reciprocating piston pump
12/26/1991WO1991019676A1 Reverse osmosis system with cycled pressure intensifiers
11/1991
11/26/1991US5067882 Dual-acting, reciprocating piston pump
10/1991
10/16/1991EP0451942A1 Double-acting positive displacement pump
10/12/1991CA2037591A1 Double-acting positive displacement pump
10/09/1991EP0450257A1 Hydraulic machine capable of releasing the pressure of one liquid and simultaneously pumping another liquid
08/1991
08/28/1991EP0443665A1 Pressure pump
05/1991
05/14/1991US5015158 Gas compressor
03/1991
03/26/1991CA1281938C Reverse osmosis system and automatic cycling booster pump therefor
03/19/1991US5000845 Reverse osmosis system and automatic cycling booster pump therefor
02/1991
02/26/1991US4995793 Reverse osmosis system and automatic cycling booster pump therefor
11/1990
11/14/1990EP0397332A1 Reverse osmosis system with automatic cycling booster pump therefor
12/1989
12/26/1989USRE33135 Pump apparatus
12/20/1989CN2049692U 电磁泵 Electromagnetic pump
08/1989
08/01/1989US4852463 Axial piston machines whose pistons are formed as stepped pistons
06/1989
06/06/1989US4836924 Reverse osmosis system and automatic cycling booster pump therefor
05/1989
05/03/1989EP0314374A2 Reverse osmosis system and automatic cycling booster pump therefor
02/1989
02/01/1989EP0301309A1 Axial piston machine with differential pistons
01/1989
01/25/1989EP0300274A1 Axial-pistons machine with differential pistons
10/1988
10/25/1988US4780064 Pump assembly and its method of operation
10/11/1988CA1242977A1 Reverse osmosis hand pump
09/1988
09/07/1988EP0280901A2 Plunger pump
03/1988
03/17/1988DE3630992A1 Apparatus for metering and mixing materials
02/1988
02/11/1988WO1988001021A1 Single and double acting fluid intensifier pump
09/1987
09/02/1987EP0234798A2 Pump
08/1987
08/26/1987CN87100647A Pump assembly and its method of operation
08/04/1987US4683810 Two-stage composite piston
02/1987
02/17/1987US4643651 Constant flow rate liquid pumping system
05/1986
05/13/1986USRE32144 For water desalination, using semi-permeable membrane
02/1986
02/12/1986EP0171371A2 Pump apparatus
10/1985
10/01/1985US4543789 Multiple displacement hydraulic pump system with automatic displacement control for brake boosters and the like
08/1985
08/13/1985US4534713 For filtering a liquid
04/1985
04/03/1985EP0136220A1 Pump system for chromatography in the liquid phase
01/1985
01/23/1985EP0131598A1 Multiple displacement hydraulic pump sytem with automatic displacement control for brake boosters and the like
07/1984
07/18/1984EP0113486A2 Proportioning device
07/10/1984CA1170532A1 Syringe pump
07/05/1984WO1984002558A1 Multiple displacement hydraulic pump sytem with automatic displacement control for brake boosters and the like
06/1984
06/19/1984US4455127 Compact size plunger pump
03/1984
03/06/1984US4435133 Free piston engine pump with energy rate smoothing
06/1983
06/08/1983EP0080923A1 Vacuum piston pump for use in the control of different mechanisms in particular
11/1982
11/23/1982US4360319 Compressor
11/09/1982US4357798 Rapid actuating device of hydraulic actuator
10/1982
10/26/1982CA1134281A1 Rotary shaft driven reverse osmosis method and apparatus
08/1982
08/10/1982US4343596 Constant flow rate liquid supply pump
04/1982
04/27/1982CA1122479A1 Double-acting differential piston supply pump
04/15/1982WO1982001223A1 Device for feeding viscous liquids
04/15/1982WO1982001222A1 Device for applying multicomponent materials
02/1982
02/16/1982CA1118365A1 Reverse osmosis method and apparatus
11/1981
11/25/1981EP0040250A1 Double acting continuous flow system type pump
11/04/1981EP0039146A1 Multiple chamber pump
10/1981
10/06/1981US4293286 Double action pump
09/1981
09/29/1981CA1109732A1 Free piston engine pump with energy rate smoothing
09/08/1981US4288326 Rotary shaft driven reverse osmosis method and apparatus
05/1981
05/28/1981WO1981001445A1 Double acting continuous flow system type pump
04/1981
04/07/1981US4260341 Hand pump
10/1980
10/29/1980EP0018128A1 Reverse osmosis method and apparatus
08/1980
08/26/1980US4218961 Lubricating system for high-pressure pump
02/1980
02/05/1980US4187173 Reverse osmosis method and apparatus
02/05/1980CA1071162A1 Method and apparatus for packaging fluent material
12/1979
12/25/1979US4179952 Lubrication means for a torque proportioning differential
04/1979
04/18/1979EP0001463A1 Plunger pump
04/17/1979US4149831 Double-acting differential piston supply pump
12/1978
12/05/1978US4128083 Gas cushioned free piston type engine
09/1978
09/26/1978CA1039108A1 Volumetric pump
06/1978
06/06/1978US4093404 Apparatus for preparation of matrices containing frangible particulate matter
05/1978
05/02/1978US4087209 Displacement slurry pump
04/1978
04/11/1978US4083186 Apparatus and method for converting hydrostatic energy to electrical energy
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