| Patents for F04B 7 - Piston machines or pumps characterised by having positively-driven valving (2,226) |
|---|
| 10/22/1991 | US5058779 Positive displacement piston metering pump |
| 10/22/1991 | CA1290979C System for controlling the operation of a reciprocating device |
| 10/09/1991 | EP0450257A1 Hydraulic machine capable of releasing the pressure of one liquid and simultaneously pumping another liquid |
| 10/01/1991 | US5053655 Motor-compressor unit |
| 09/24/1991 | US5051074 Bi-directional reciprocating pump mechanism |
| 09/11/1991 | EP0233200B1 Positive displacement piston pump |
| 09/03/1991 | US5044900 Positive displacement shuttle pump |
| 09/03/1991 | US5044889 Phase adjustable metering pump, and method of adjusting the flow rate thereof |
| 09/03/1991 | CA1288284C Compact twin piston pump |
| 08/08/1991 | DE4102945A1 Chain-saw oil pump - has worm drive unit with sliding coupling to separate pump |
| 08/06/1991 | US5037275 Pipe junction switch for two-cylinder thick-material pump |
| 07/17/1991 | EP0437261A2 Pump with multi-port discharge |
| 07/17/1991 | EP0436999A1 Motor-compressor unit |
| 07/10/1991 | EP0436512A2 Valveless positive displacement pump |
| 07/10/1991 | EP0380576A4 Compact twin piston pump |
| 06/18/1991 | US5024587 Valveless pump |
| 06/12/1991 | EP0430939A1 Axial control valve |
| 06/11/1991 | US5022831 Positive displacement pump with rotating reciprocating piston |
| 06/04/1991 | US5020980 Valveless, positive displacement pump including hinge for angular adjustment |
| 06/04/1991 | US5020979 Injection pump having pilot and main injection |
| 06/02/1991 | CA2031132A1 Solution pumping system including disposable pump cassette |
| 05/14/1991 | US5015157 Pump with multi-port discharge |
| 05/14/1991 | US5014882 Pivot-action portioning apparatus and method |
| 05/02/1991 | EP0424859A2 Tube pump mechanism and ink jet recording apparatus equipped therewith |
| 04/30/1991 | US5011381 Hand-held vacuum pump vacuum release |
| 04/18/1991 | WO1991005163A1 Improved fluid-working machine |
| 04/17/1991 | EP0422745A1 Concrete-pumping device |
| 04/10/1991 | EP0421461A1 Axial piston pump |
| 04/04/1991 | WO1991004414A1 Radial piston pump |
| 03/19/1991 | CA1281592C Device for transporting suspensions of dense materials and a process for its operation |
| 02/20/1991 | CN1049398A Volumetric pump and process for pumping volumetrically |
| 02/19/1991 | US4993598 Liquid or pasty pharmaceuticals, cosmetics, foodstuffs or products |
| 02/05/1991 | US4990066 Metering pump |
| 01/22/1991 | US4986727 Pressure-operated oil and gas well swabbing device |
| 01/10/1991 | WO1991000219A1 Liquid dispensing pump |
| 01/08/1991 | US4983103 Annular plunger pump |
| 01/02/1991 | CN2068599U Assembly combined reciprocatable pump valve group |
| 01/02/1991 | CN2068596U High pressure sprinkler |
| 12/25/1990 | US4979884 Multi-cylinder pump for heavy flowable materials |
| 12/05/1990 | EP0400496A1 Volumetric pump and method for volumetric pumping |
| 11/29/1990 | WO1990014578A1 Pivot-action portioning apparatus |
| 11/28/1990 | CN1047368A Pump apparatus for biomedical use |
| 11/22/1990 | EP0398583A2 Pump apparatus for biomedical use |
| 11/20/1990 | US4971532 Oil metering pump with air purge |
| 10/31/1990 | EP0395599A1 A passively actuated valve |
| 10/23/1990 | US4964533 Pumping system |
| 10/02/1990 | US4960369 Rotatably driven positive displacement pump |
| 09/20/1990 | DE4007832A1 Piston pump for medical purposes - incorporates chamber for sterilising piston |
| 09/19/1990 | EP0293382B1 Submersible positive displacement piston pump |
| 08/23/1990 | DE3905366A1 Tube switch for twin-cylinder viscous-material pumps |
| 08/23/1990 | DE3905355A1 Switch-over pipe for two-cylinder industrial pump - using sealing ring containing stabilising ring to prevent movement due to pumped material |
| 08/23/1990 | DE3904862A1 Tube switch for twin-cylinder viscous-material pumps |
| 08/21/1990 | US4950134 Precision liquid dispenser |
| 08/14/1990 | US4947696 Bellow pump for gas test tube |
| 08/08/1990 | EP0380576A1 Compact twin piston pump |
| 08/07/1990 | US4946355 Orbital pump |
| 07/18/1990 | EP0226611B1 A dosing device |
| 07/17/1990 | US4941809 Valveless positive displacement metering pump |
| 07/10/1990 | US4940399 Piston cap and boot seal for a medication infusion system |
| 07/04/1990 | EP0376815A1 Pump for dosing small amounts, especially for the lubrication of two-stroke engines |
| 07/04/1990 | EP0376497A1 Precision liquid dispenser |
| 06/14/1990 | WO1990006444A1 Process and device for control of a twin-cylinder thick matter pump |
| 06/13/1990 | CN1008387B Control valve for viscous material pump |
| 06/07/1990 | DE3840892A1 Verfahren und vorrichtung zur steuerung einer zweizylinder-dickstoffpumpe Method and device for controlling a two-cylinder thick fuel pump |
| 05/16/1990 | CN1042218A 泵 Pump |
| 04/25/1990 | EP0364519A1 Multi-cylinder piston pump |
| 04/18/1990 | CN1007643B Submersible positive displacement piston pump |
| 04/11/1990 | EP0363088A1 Pump |
| 04/05/1990 | WO1990003519A1 Pump control method and poppet valve therefor |
| 04/04/1990 | EP0361927A1 Pump control method and poppet valve therefor |
| 03/27/1990 | US4911616 Micro miniature implantable pump |
| 02/14/1990 | EP0354484A1 Dosing pump |
| 02/08/1990 | WO1990001117A1 Pipe shunt for a two-cylinder pump for viscous fluids |
| 01/25/1990 | DE3824466A1 Mehrzylinder-dickstoffpumpe Multi-cylinder thick fuel pump |
| 01/11/1990 | DE3823397A1 Pump for liquid or pasty drugs, cosmetics, foodstuffs or the like |
| 01/09/1990 | US4892468 Hydraulic pump |
| 12/26/1989 | USRE33135 Pump apparatus |
| 12/20/1989 | EP0346611A2 Pump heatsterilisation process |
| 12/05/1989 | US4884594 Compact twin piston pump |
| 11/30/1989 | DE3840972A1 Pumping appliance |
| 11/08/1989 | CN2047310U Radial type rotor centrifugal piston pump |
| 11/08/1989 | CN2047309U Pneumatic variable-capacity type deep well pump |
| 10/19/1989 | DE3811404A1 Engine and machine with a rotary and translatory piston |
| 10/12/1989 | DE3810127A1 Drive for displacement machines |
| 10/05/1989 | WO1989009339A1 Multi-cylinder piston pump |
| 09/26/1989 | US4869655 Compact twin piston pump |
| 09/26/1989 | US4869653 Compact twin piston pump |
| 09/05/1989 | US4863358 Submersible positive displacement piston pump |
| 09/05/1989 | US4863317 Particulate material transportation |
| 08/08/1989 | US4854838 Hydraulic pump gate apparatus |
| 08/08/1989 | US4854837 Rotary actuated pump or motor |
| 08/01/1989 | US4852467 Spool valve for concrete pumps |
| 07/25/1989 | US4850824 Arrangement for control of the stroke length |
| 07/25/1989 | US4850817 Mechanical drive system for a medication infusion system |
| 07/18/1989 | US4847999 Chain saw |
| 07/18/1989 | CA1257630A1 Evacuated pumping system |
| 06/07/1989 | EP0319276A1 Piston cap and boot seal for a medication infusion system |
| 06/07/1989 | EP0319274A1 Mechanical drive system for a medication infusion system |
| 05/24/1989 | EP0316547A1 Coupling for transmitting torque from a first shaft to a second shaft |
| 05/24/1989 | EP0316537A1 Dosing pump |