| Patents for F04B 3 - Machines or pumps with pistons coacting within one cylinder, e.g. multi-stage (444) |
|---|
| 08/10/1999 | US5934889 Pump driven by cam having the cylinder supported by the cam shaft |
| 08/03/1999 | US5931647 For pumping fluids from a fluid source to a fluid sink |
| 07/22/1999 | DE19801188A1 Foot pump for driving hydraulic tools, cylinders, and suchlike, and could be used to drive cutting tool for separation of cables under tension |
| 07/07/1999 | EP0927305A1 Piston pump |
| 06/15/1999 | CA2089035C Pressure testing pump |
| 04/06/1999 | US5890417 Piston for a reciprocating compressor |
| 02/25/1999 | WO1998052624A3 Volumetric pump with sterility seal |
| 02/24/1999 | EP0897473A1 Disposable ambulatory microprocessor controlled volumetric pump |
| 01/28/1999 | WO1999004165A1 Piston pump |
| 01/21/1999 | DE19743747A1 Kolbenpumpe Piston pump |
| 11/26/1998 | WO1998052624A2 Volumetric pump with sterility seal |
| 10/13/1998 | US5820354 Cascaded progressing cavity pump system |
| 10/08/1998 | WO1998020259A3 Cascaded progressing cavity pump system |
| 09/24/1998 | DE19811836A1 Rotary piston fluid pump |
| 09/15/1998 | US5807075 Disposable ambulatory microprocessor controlled volumetric pump |
| 09/01/1998 | US5799690 Volumetric pump valve |
| 07/29/1998 | EP0855507A2 Volumetric pump with bi-directional sphincter seal apparatus and method |
| 06/23/1998 | CA2132044C Pneumatically actuated lubricant pump |
| 05/14/1998 | WO1998020259A2 Cascaded progressing cavity pump system |
| 01/20/1998 | US5710401 Volumetric pump/valve |
| 11/13/1997 | WO1997042410A1 Disposable ambulatory microprocessor controlled volumetric pump |
| 10/08/1997 | CN2264259Y Balance single-action high-lift hydraulic piston pump |
| 08/12/1997 | US5655779 Resilient rectangular lip seal arrangement |
| 07/15/1997 | US5647575 Volumetric shaft/valve |
| 05/27/1997 | US5632606 For pumping fluids from a fluid source to a fluid sink |
| 04/16/1997 | CN1034601C Gas Compressors |
| 04/08/1997 | US5618163 Volumetric pump shift bottoming detector |
| 04/03/1997 | DE19536491A1 Electrically-operated gas or fluid feed valveless pump |
| 02/18/1997 | US5603354 Volumetric pump/valve |
| 02/11/1997 | US5601417 Hydraulic pump with ball bearing pistons |
| 01/07/1997 | US5591012 Conveying pump for supply containers of various heights |
| 11/19/1996 | US5575627 High and low pressure two stage pump and pumping method |
| 11/13/1996 | CN1033290C A gas compressor having variable-volume clearance pocket |
| 11/12/1996 | US5573381 Internally regulated self priming fuel pump assembly |
| 09/17/1996 | US5556263 Volumetric pump and value |
| 08/14/1996 | EP0726393A1 Cryogenic pump |
| 08/06/1996 | US5542827 Multiple nested pistons hand priming pump with spring biasing |
| 07/04/1996 | DE19546299A1 Double piston pump for particle analyzer |
| 06/18/1996 | US5526962 Double piston pump for administering medication |
| 05/07/1996 | US5513962 Pneumatically actuated lubricant pump |
| 04/30/1996 | US5511955 Cryogenic pump |
| 04/10/1996 | EP0613527B1 Piston machine for use as a compressor or motor |
| 01/02/1996 | US5479846 Machine for exchanging energy |
| 11/22/1995 | EP0683318A1 Pneumatically actuated pump |
| 10/18/1995 | CN1110374A Underground booster |
| 08/16/1995 | CN2205451Y high pressure hot steam water pump for boiler |
| 05/24/1995 | EP0654278A2 Volumetric pump/valve |
| 04/04/1995 | US5403168 Double acting pump having inlet and outlet poppet valves |
| 02/15/1995 | EP0638721A1 Feed pump |
| 11/22/1994 | US5366904 Method of metering a fluid using a multi-mode differential fluid displacement pump |
| 11/17/1994 | EP0624379A1 Double acting piston pump for medical use |
| 10/04/1994 | US5351657 Modular power unit |
| 09/08/1994 | DE4323733C1 Delivery pump |
| 12/29/1993 | EP0576133A1 Gas compressors |
| 12/29/1993 | CN1080027A 气体压缩机 Gas compressor |
| 10/06/1993 | EP0564394A1 Pressure testing pump |
| 09/29/1993 | CN1076763A A gas compressor having a variable-volume clearance pocket, and means for varying a clearance pocket in a gas compressor |
| 06/22/1993 | US5221195 Pressure testing pump |
| 05/27/1993 | WO1993010353A1 Piston machine for use as a compressor or motor |
| 05/11/1993 | US5209647 Straight cylinder gas compressor with a reduced diameter compression chamber |
| 03/31/1993 | EP0534649A1 Gas compressor having a variable-volume clearance pocket |
| 03/27/1993 | CA2079047A1 Gas compressor having a variable-volume clearance pocket, and means for varying a clearance pocket in a gas compressor |
| 02/23/1993 | CA1313794C Rotatably driven positive displacement pump |
| 01/21/1993 | WO1993001411A1 Sleeve piston pump |
| 11/10/1992 | US5161491 Internal combustion engine |
| 08/25/1992 | US5141413 Gas compressor having a variable-volume clearance pocket, and means for varying a clearance pocket in a gas compressor |
| 08/19/1992 | EP0498981A1 Gas compressor |
| 07/23/1992 | WO1992012346A1 Pumps |
| 07/15/1992 | EP0494653A1 Low cost linear actuator |
| 05/07/1992 | DE4035139A1 Eccentric shaft slide piece - has equalising ring with spars, and rotary cam |
| 05/14/1991 | US5015158 Gas compressor |
| 10/02/1990 | US4960369 Rotatably driven positive displacement pump |
| 08/15/1990 | CN2060483U Multiplication oil-well pump |
| 07/17/1990 | US4941808 Multi-mode differential fluid displacement pump |
| 01/03/1990 | EP0349264A2 Multi-mode differential fluid displacement pump |
| 04/05/1989 | EP0310254A2 Reciprocating pump unit |
| 02/21/1989 | CA1250219A1 Pump for cryogenic fluids |
| 02/15/1989 | CN2032567U Gas inflating pump for motorcycle |
| 02/01/1989 | CN1030813A Bounce chambers for multi-cylinder linear engine compressors |
| 01/26/1989 | DE3723499A1 Hydraulic force generator |
| 11/23/1988 | CN88210056U Serial double-chamber pump |
| 03/30/1988 | CN86106337A Pump with dual pistons fitted with valves |
| 03/15/1988 | US4730992 Continuously operable hydraulic device |
| 02/02/1988 | US4722675 Piston proportioning pump |
| 01/19/1988 | US4720247 Oil well pump |
| 09/17/1987 | DE3608702A1 Pumping device for delivering liquids |
| 06/03/1987 | CN86207042U Double piston pump with valve |
| 03/17/1987 | US4649801 Compound displacement mechanism for simplified motors and compressors |
| 01/27/1987 | US4639197 Pump for cryogenic fluids |
| 01/13/1987 | US4636150 Low power electromagnetic pump |
| 07/08/1986 | US4598630 Double acting self-flushing pump |
| 03/12/1986 | EP0174269A2 Pump for cryogenic fluids |
| 02/11/1986 | US4569641 Low power electromagnetic pump |
| 02/05/1986 | EP0170367A2 Low power electromagnetic pump |
| 02/04/1986 | US4568250 Low power electromagnetic pump |
| 02/04/1986 | US4568249 Variable reciprocating plunger pump |
| 01/01/1986 | CN85200215U Axial plunger pump combined with a motor |
| 11/19/1985 | US4553912 Cylinder-piston of a rotary compressor |
| 08/27/1985 | US4537562 Pump |
| 08/13/1985 | US4534714 Fluid operating device |