| Patents for F04C 2 - Rotary-piston machines or pumps (14,296) |
|---|
| 12/20/1989 | CN1006175B Pump with half-round cam rotor |
| 12/20/1989 | CN1006166B Double-eccentric center internal axle revolving piston machinery |
| 12/19/1989 | US4887956 Variable output oil pump |
| 12/14/1989 | WO1989012167A1 Improvements relating to gerotor pumps |
| 12/13/1989 | EP0345978A1 Improvements relating to gerotor pumps |
| 12/07/1989 | DE3818508A1 Sterilisable model of an eccentric screw pump |
| 11/29/1989 | EP0344059A1 Rotary gear apparatus for the circulation of a fluid |
| 11/29/1989 | EP0343166A1 Gear machine (pump or engine). |
| 11/21/1989 | US4881880 Drain for internal gear hydraulic device |
| 11/08/1989 | CN1037020A 螺旋柱塞机 Spiral piston machine |
| 11/08/1989 | CN1037019A Gear type variable rate pump or motor |
| 11/08/1989 | CN1005742B Rotary fluid pressure device having free-wheeling capability |
| 11/02/1989 | WO1989010487A1 Roller-blade hydraulic machine |
| 11/02/1989 | EP0339327A1 Conveying device for pasty products |
| 11/02/1989 | DE3813647A1 Rotary pump |
| 11/01/1989 | CN2046940U Tri-oscillating single-screw pump |
| 10/31/1989 | US4877383 Device having a sealed control opening and an orbiting valve |
| 10/26/1989 | DE3812794A1 Rotary pump |
| 10/25/1989 | EP0225338B1 Variable capacity pump |
| 10/25/1989 | CN1036620A Waveform actuating air compressor |
| 10/24/1989 | US4875841 Staggered rotor gerotor device |
| 10/24/1989 | CA1262483A1 Method and device for pumping a highly viscous liquid |
| 10/19/1989 | WO1989009881A1 A method for manufacturing screw rotors |
| 10/18/1989 | CN1005496B Eddy fluid machinery |
| 10/12/1989 | DE3809661A1 Apparatus for continuously mixing a building material |
| 10/10/1989 | US4872819 Rotary gerotor hydraulic device with fluid control passageways through the rotor |
| 10/10/1989 | US4872818 Rotary pump having alternating pistons controlled by non-circular gears |
| 09/27/1989 | EP0334646A1 Hysteresis magnet coupling for roots type pumps |
| 09/27/1989 | EP0334302A1 Prime mover with at least two variable-volume working chambers |
| 09/27/1989 | EP0334040A1 Gear machine (pump or motor) |
| 09/27/1989 | CN2045031U Dual-purpose variable paddle pump |
| 09/26/1989 | US4869648 Vane type rotary fuel pump |
| 09/20/1989 | EP0333391A2 Vane pump |
| 09/06/1989 | CN2044012U Floating shaft gear pump and gear motor |
| 09/05/1989 | US4863359 Stator for eccentric worm pumps |
| 08/30/1989 | EP0330640A1 Turbine motor pump and rotary pump |
| 08/30/1989 | EP0330315A2 Gerotor pumps |
| 08/30/1989 | CN2043678U Oil pump gear |
| 08/24/1989 | DE3804633A1 Gear pump |
| 08/23/1989 | EP0328745A2 Internal gear machine |
| 08/22/1989 | US4859161 Gear pump |
| 08/22/1989 | US4859160 Cutaway rotor gerotor device |
| 08/22/1989 | US4858714 Hydrostatic steering device |
| 08/10/1989 | DE3802650A1 Adjustable tension clamp for eccentric worm screw pump |
| 08/08/1989 | CA1258275A1 Hydraulic seals |
| 08/02/1989 | CN2042121U Low-pulsation and low-noise gear pump |
| 08/02/1989 | CN1034406A 旋转活塞机 Rotary piston machine |
| 07/19/1989 | EP0323979A1 Rotary machine |
| 07/13/1989 | DE3838658A1 Hydraulic gear pump |
| 07/12/1989 | EP0323834A2 Sealless pump |
| 07/12/1989 | CN2040959U Screw plunger machine |
| 06/29/1989 | DE3842988A1 Gear pump |
| 06/29/1989 | DE3840909A1 Gear pump with delivery rate control |
| 06/28/1989 | EP0321483A1 Rotary pump with minimized friction and respecting the integrity of conveyed material |
| 06/27/1989 | US4842500 Vane pump with positioning pins for cam ring |
| 06/13/1989 | CA1255539A1 Offset three-gear, two-system pump |
| 06/06/1989 | US4836760 Inlet for a positive displacement pump |
| 06/06/1989 | US4836759 Rotary pump with orbiting rotor of harder material than stator |
| 06/06/1989 | CA1255187A1 Rotary motion fluid apparatus |
| 05/24/1989 | EP0316346A1 Rotating piston machine. |
| 05/24/1989 | DE3737403A1 Hydraulische zahnradmaschine (pumpe oder motor) Hydraulic gear machine (pump or motor) |
| 05/18/1989 | DE3737961A1 Internal-gear pump |
| 05/18/1989 | DE3737358A1 Bearing housing for an inside-mounted screw pump, and method for its manufacture |
| 05/17/1989 | EP0315878A2 Internal gear pump |
| 05/09/1989 | US4828468 Balanced roller vane pump having reduced pressure pulses |
| 05/09/1989 | US4827800 Multi-groove and spline connection between gear shaft of a rotary piston machine with internal axis and method of making such a multigroove spline connection |
| 05/09/1989 | CA1253771A1 Hydraulic pump |
| 04/25/1989 | US4824347 Internal gear machine with reinforced housing |
| 04/19/1989 | CN2036217U Low-fluctuation and low-noise gear pump |
| 04/18/1989 | US4822265 Pump rotor |
| 04/18/1989 | US4822263 Sliding-vane rotary compressor |
| 04/18/1989 | US4822260 Device for controlling fluid supply to a rotary piston machine |
| 04/05/1989 | EP0310292A2 Bearing bush for a gear pump |
| 04/04/1989 | US4818197 Progessive cavity pump |
| 03/29/1989 | EP0309130A2 Internal gear machine |
| 03/29/1989 | CN2035006U Single-gear pump |
| 03/28/1989 | US4815954 Offset three-gear, two-system pump |
| 03/21/1989 | US4813858 For a power steering apparatus |
| 03/21/1989 | US4813856 Balanced rotary valve plate for internal gear device |
| 03/21/1989 | US4813853 Internal gear pump |
| 03/16/1989 | DE3829547A1 Internal-gear pump |
| 03/15/1989 | EP0307365A2 Rotary pump for semisolid products particulary for filling sausages with minced meat |
| 03/15/1989 | EP0306735A1 Valve control for an internal-combustion engine by means of a rotary-piston pump using an intermittent flow rate |
| 03/08/1989 | EP0305618A1 Orbital pump |
| 03/08/1989 | CN1031583A Valve gear for internal combustion machine driven by uneven pumping power of rotary piston pump |
| 03/07/1989 | CA1250789A1 Low pressure lubrication system for fluid device |
| 03/01/1989 | EP0304716A2 Bolt coupling for excentric srew pumps |
| 02/23/1989 | DE3726800A1 Fluegelzellenmaschine Fluegelzellenmaschine |
| 02/16/1989 | DE3824686A1 Gerotor-motor/pumpe Gerotor motor / pump |
| 02/08/1989 | EP0302728A2 Rotary valve plate |
| 02/08/1989 | EP0302190A1 Internal-gear machine |
| 02/02/1989 | DE3724023A1 Process for producing stators for eccentric screw pumps |
| 02/01/1989 | EP0301886A2 Variable discharge gear pump with energy recovery |
| 02/01/1989 | EP0301158A2 Oil pump |
| 01/31/1989 | US4801258 Apparatus for quantitatively extruding food material |
| 01/25/1989 | EP0300269A1 Steering control unit with flow amplification |
| 01/25/1989 | EP0300175A2 Rotary-piston machine |
| 01/25/1989 | CN2031460U Sliding vane type compressor equipped with automatically adjusting slide valve |
| 01/11/1989 | EP0254721B1 Vane pump |
| 01/11/1989 | CN2030663U Multi-functional composite gear pump with multiple oil-feeding points |