| Patents for F04B 7 - Piston machines or pumps characterised by having positively-driven valving (2,226) |
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| 01/05/1994 | EP0576467A1 Distillation. |
| 11/24/1993 | CN1022852C Pump apparatus for biomedical use |
| 11/16/1993 | US5261795 Volumetric pump and process for volumetric pumping |
| 11/09/1993 | US5259738 Fluid-working machine |
| 10/28/1993 | WO1993020864A1 Infusion pump |
| 10/13/1993 | EP0564575A1 Solution pumping system with compressible pump cassette |
| 10/12/1993 | US5252037 Piston valved vertical pump for particulate materials |
| 10/07/1993 | DE4211015A1 Piston pump or membrane pump for delivery of fuel to burner for heater - uses balancing system of cylinder chamber and piston to ensure pulsation-free output. |
| 10/07/1993 | DE4210755A1 Hydraulically operated valve for sludge pipe - has sliding fit valve with profiled sealing edge which has sealing rings made of wear resistant metal |
| 10/05/1993 | US5249933 Submarine external hydraulic fluid - isolated system |
| 09/30/1993 | DE4209690A1 Piston engine with inlet and outlet port - has piston face with sinusoidal groove in which cam in cylinder is operated to open/close ports |
| 09/29/1993 | EP0562498A1 Pump for thick materials with delivery cylinders, in particular two-cylinder pump for concrete |
| 09/25/1993 | CA2092397A1 Pump for thick matter having delivery cylinders, in particular a two-cylinder concrete pump |
| 09/22/1993 | EP0561262A1 Pump for viscous materials having cylinders, in particular two cylinder concrete pump |
| 09/21/1993 | US5246354 Valveless metering pump with reciprocating, rotating piston |
| 09/20/1993 | CA2092044A1 Slurry pump with discharge cylinders, especially two-cylinder concrete pump |
| 09/15/1993 | CN1022125C Volumetric pump |
| 09/09/1993 | DE4207318A1 Acid-resistant laboratory metering pump - has two piston-type rotary valve pump units arranged in parallel and phase-displaced by 180 deg. |
| 08/12/1993 | DE4303745A1 Multi-piston compressor for vehicle air conditioning system - has suction valves synchronised to move in accordance with piston strokes |
| 08/05/1993 | WO1993015316A1 Valveless metering pump with reciprocating, rotating piston |
| 08/03/1993 | US5232353 Pressurized diaphragm pump and directional flow controller therefor |
| 07/15/1993 | DE4200707A1 Double or single acting reciprocating piston engine - has rocker arm between side of cylinder bore and crankshaft journal |
| 07/07/1993 | CN1074019A Valving method for low-noise axial plunger pump and valve plate structure |
| 06/17/1993 | DE4237890C1 Wear part useful in machine building - has coating of hard substances on sealing surface sliding on another surface |
| 06/16/1993 | EP0446206B1 Process and device for control of a twin-cylinder thick matter pump |
| 06/15/1993 | CA1319069C Mechanical drive system for a medication infusion system |
| 06/15/1993 | CA1319067C Piston cap and boot seal for a medication infusion pump |
| 05/12/1993 | EP0540944A1 Metering pump for viscous products |
| 04/28/1993 | CN1071390A Gate-valve device for concrete pump |
| 04/27/1993 | US5205819 Pump apparatus for biomedical use |
| 04/08/1993 | DE4232215A1 Slider assembly for controlling concrete flow - has S=shaped swivel tube with its drive between two bearings |
| 03/04/1993 | WO1993004282A1 Hydraulic control device for a viscous fluid pump |
| 03/04/1993 | CA2115845A1 A hydraulic control device for a viscous fluid pump |
| 03/03/1993 | EP0529393A1 Dosing pump |
| 03/02/1993 | US5190446 Pump control method and poppet valve therefor |
| 02/28/1993 | CA2076062A1 Method and device for dosing pumping |
| 02/23/1993 | CA1313794C Rotatably driven positive displacement pump |
| 02/18/1993 | DE4127277A1 Hydraulische steuerungseinrichtung fuer eine dickstoffpumpe Hydraulic control device for a thick fuel pump |
| 02/09/1993 | US5184943 Rolling diaphragm injection pump |
| 01/19/1993 | US5180294 Concrete pump having pressurized seal for swing tube |
| 01/05/1993 | US5176296 Precompression metering-proportioning pump enabling its efficiency to be improved by early admission into the pump working space |
| 12/29/1992 | WO1993000574A1 Method and apparatus for calibrating a multiple port pump |
| 12/29/1992 | US5174472 Control system for timing a sequence of events |
| 12/24/1992 | DE4134882A1 Fluid- or paste-pump - has seal between piston and cylinder shutting off intervening annular chamber during sterilisation |
| 12/23/1992 | EP0519217A1 Oscillating valve for a two-piston concrete pump |
| 12/01/1992 | US5167837 Filtering and dispensing system with independently activated pumps in series |
| 12/01/1992 | US5167181 Fluid transfer devices |
| 11/25/1992 | CN1019225B Pump |
| 11/17/1992 | US5163877 Joint for the transmission of torque from a first shaft to a second shaft |
| 11/17/1992 | US5163822 Radial piston pump |
| 11/11/1992 | EP0512688A2 Proportioning pump |
| 11/10/1992 | US5161491 Internal combustion engine |
| 11/05/1992 | DE4211068A1 Air compressor for motor vehicle - has outlet valve to reservoir, inlet valve controlled according to pressure in reservoir by electromagnet using clocking frequency dependent on pressure |
| 10/27/1992 | USRE34114 Positive displacement piston pump |
| 10/27/1992 | US5158441 Proportioning pump |
| 10/07/1992 | EP0425567B1 Pipe shunt for a two-cylinder pump for viscous fluids |
| 10/06/1992 | US5152678 Fluid sampling pump |
| 10/01/1992 | WO1992016747A1 Method for the dosage of a fluidized polymerization catalyst into a polymerization reactor |
| 09/29/1992 | US5151019 Pumping device having inlet and outlet valves adjacent opposed sides of a tube deforming device |
| 09/03/1992 | WO1992014531A1 Distillation |
| 08/06/1992 | WO1992012794A1 Piston burette |
| 07/23/1992 | WO1992012345A1 Solution pumping system with compressible pump cassette |
| 07/23/1992 | DE4101089A1 Pump valve carrying solids in suspension fluid - has elastic sealing collar at valve rod end, pressing against sealing ring |
| 07/23/1992 | CA2111119A1 Solution pumping system with compressible pump cassette |
| 07/16/1992 | DE4123075A1 Distributor for thick material carried along pipes - consists of branch pipe with outlet pipes, and two outlet holes, with closure surface |
| 07/16/1992 | DE4100886A1 Kolbenbuerette Piston |
| 07/15/1992 | EP0494236A1 Improved fluid-working machine. |
| 07/07/1992 | US5127547 Metering and dispensing apparatus |
| 07/01/1992 | EP0491809A1 Radial piston pump. |
| 06/02/1992 | CA1302162C2 Compact twin piston pump |
| 05/26/1992 | CA1301546C2 Compact twin piston pump |
| 05/26/1992 | CA1301545C2 Compact twin piston pump |
| 05/20/1992 | EP0485862A1 Slurry pump having a pair of alternatively sucking and delivering cylinders |
| 05/19/1992 | US5114319 Concrete-pumping device |
| 05/13/1992 | CN2104320U Digital axial plunger variable pump variable mechanism |
| 05/07/1992 | DE4102704A1 High pressure drive unit, control or pump - has reciprocating pistons on timed basis and activated and controlled by fluid pressure |
| 04/30/1992 | WO1992007190A1 Double piston portioning apparatus |
| 04/29/1992 | EP0482774A2 Positive displacement pump with rotating reciprocating piston |
| 04/25/1992 | CA2052201A1 Positive displacement pump with rotating reciprocating piston and improved pulsation dampening |
| 04/21/1992 | US5105852 Tubular valve arrangement |
| 04/07/1992 | US5102310 Axial piston pump |
| 03/24/1992 | US5098262 Solution pumping system with compressible pump cassette |
| 03/17/1992 | US5096394 Positive displacement pump with rotating reciprocating piston and improved pulsation dampening |
| 03/10/1992 | US5094428 Passively actuated valve |
| 03/03/1992 | US5092037 Method of making a valveless positive displacement pump including a living hinge for angular adjustment |
| 02/20/1992 | WO1992002730A1 Free-piston engine |
| 02/12/1992 | EP0470906A1 Precompression-dosing pump having improved efficiency by allowing early take in of fluid into the pump chamber |
| 02/06/1992 | DE4024591A1 Freikolbenmotor Free-piston engine |
| 01/23/1992 | WO1992001159A1 Feeding reservoir for thick matter, two-cylinder pump |
| 01/14/1992 | CA1294174C Constant clearance positive displacement piston pump |
| 01/09/1992 | DE4120466A1 Materialaufgabebehaelter fuer zweizylinder-dickstoffpumpen Materialaufgabebehaelter for two-cylinder thick slurry pumps |
| 01/08/1992 | EP0464301A1 Phase adjustable metering pump, and method of adjusting the flow rate thereof |
| 12/24/1991 | US5074767 Positive displacement pump with rotating reciprocating piston and improved lubrication feature |
| 12/10/1991 | US5071326 Double piston portioning apparatus |
| 12/03/1991 | CA1292640C Valveless positive displacement metering pump |
| 12/03/1991 | CA1292639C Submersible positive displacement piston pump |
| 11/27/1991 | EP0458114A1 Radial piston pump |
| 11/21/1991 | DE4015674A1 Slide for concrete pump - has reciprocating slide in chamber driven via piston rod and two plunger cylinders |
| 11/05/1991 | US5062774 Solution pumping system including disposable pump cassette |
| 10/29/1991 | US5061158 Multi-cylinder piston pump |