| Patents for F04C 2 - Rotary-piston machines or pumps (14,296) |
|---|
| 09/25/1990 | US4958992 Variable capacity swivelling vane pump |
| 09/19/1990 | EP0387713A2 Gerotor type hydraulic motor or pump |
| 09/19/1990 | EP0316346B1 Rotating piston machine |
| 09/19/1990 | CN1045444A Positive-displacement rotor pump with cavity of spiral curved surface |
| 09/18/1990 | US4957420 Vane pump with guide means for regulating movement of vane |
| 09/18/1990 | US4957161 Device for pumping a fluid at the bottom of a well |
| 09/13/1990 | DE3939653A1 Twin-wheel externally meshing gear pump - with application of pump pressure to free gear |
| 09/13/1990 | DE3939652A1 Twin wheel externally meshing gear pump - incorporates roller bearings to support free gear |
| 09/05/1990 | EP0385211A1 Rotary hydraulic machine |
| 09/05/1990 | CN2061620U Manual rotary water pump |
| 08/29/1990 | EP0384335A1 Rotary hydraulic machine |
| 08/29/1990 | CN2061220U Hand water pump |
| 08/29/1990 | CN2061219U Rotor pump with semi-circular cam |
| 08/21/1990 | US4950135 Piezoelectric powered scroll compressor |
| 08/14/1990 | US4947646 Radial vane hydraulic machine |
| 08/14/1990 | CA1272637A1 Gear pump |
| 08/09/1990 | WO1990008899A1 Gear pump |
| 08/08/1990 | EP0381413A2 Helical gear pump |
| 08/08/1990 | EP0380771A1 Method and apparatus for manufacturing casings, especially long casings, for excentric screw pumps or motors |
| 08/08/1990 | CN1044518A Disk-type rotary piston pump |
| 08/02/1990 | DE3902902A1 Submerged pump |
| 08/01/1990 | EP0380051A2 Eccentric spiral pump |
| 08/01/1990 | EP0380050A2 Stator arrangement for eccentric spiral pumps |
| 07/31/1990 | US4944662 Reversible geroter pump with pivoting carrier unidirectional flow |
| 07/12/1990 | WO1990007631A1 Rotary suction and discharge apparatus |
| 07/10/1990 | US4940394 Adjustable wearplates rotary pump |
| 07/10/1990 | US4940385 Rotary disc pump |
| 07/03/1990 | US4938671 Rotary roller pump with complementary ribs and grooves between housing, rotor and rollers |
| 07/03/1990 | US4938668 Rotating piston machine |
| 06/27/1990 | EP0375337A2 Parts for use in rotary gear pump |
| 06/19/1990 | US4934913 Internal-gear machine with fluid opening in non-bearing tooth flank |
| 06/19/1990 | US4934911 Hydraulic rotary piston engine having inproved commutator valve |
| 06/12/1990 | US4932850 Rotary drive having inner and outer interengaging rotors |
| 06/06/1990 | CN1042757A 偏心转子泵 Eccentric rotor pump |
| 05/30/1990 | EP0262189B1 High-pressure hydraulic generator-receiver for power transmission |
| 05/23/1990 | EP0214164B1 Positive displacement machine, particularly pump |
| 05/22/1990 | US4927340 Synchronizing and unloading system for scroll fluid device |
| 05/22/1990 | US4927333 Fluid pump |
| 05/22/1990 | US4927332 Vane pump |
| 05/17/1990 | DE3838133A1 Gear machine (pump or motor) |
| 05/16/1990 | EP0368124A1 Multistage Roots pump and its assembly method |
| 05/15/1990 | US4925372 Fuel pump for aircraft turbine engines |
| 05/10/1990 | DE3837599A1 Gear pump having two pairs of gear wheels arranged next to one another in the pump casing |
| 05/10/1990 | DE3837364A1 Screw pump comprising a screw piston performing a circular rotation, and a moving double-walled rubber cylinder |
| 05/09/1990 | EP0367046A1 Hydrostatic rotary piston machine |
| 05/08/1990 | US4923376 Moineau pump with rotating closed end outer member and nonrotating hollow inner member |
| 05/03/1990 | DE3935293A1 Vane-type pump assembly - has tank containing hollow plastics insert held by pressure plate against housing |
| 05/02/1990 | EP0366347A2 Improvements in mechanical pumps |
| 04/26/1990 | DE3934280A1 Radial sliding vane pump - with specified lining for rotor and rotor drive shaft |
| 04/25/1990 | CN2056455U Constant direction rotor oil pump |
| 04/24/1990 | US4919601 Waveform actuating air compressor |
| 04/18/1990 | EP0213154B1 Rotary motion fluid apparatus |
| 04/18/1990 | CN1007648B Wearless sealing type power machine with sliding blade |
| 04/18/1990 | CN1007646B Radial-movable variable-dispacement gear pump (motor) |
| 04/17/1990 | US4917585 Gerotor motor or pump having sealing rings in commutator members |
| 04/12/1990 | DE3834106A1 Rotor of an eccentric screw pump |
| 04/11/1990 | EP0362906A2 Internal gear pump |
| 04/05/1990 | WO1990003521A1 Eccentric spiral pump |
| 04/04/1990 | EP0362133A1 Fluid machine for incompressible mediums |
| 04/04/1990 | EP0361716A2 Improvements relating to gerotor pumps |
| 04/03/1990 | US4913631 Turbine-driven rotary pump |
| 04/03/1990 | US4913629 Wellpoint pumping system |
| 03/28/1990 | EP0359837A1 Rotary piston pump |
| 03/28/1990 | CN1007369B Floating shaft type gear pump-gear motor |
| 03/27/1990 | US4911621 Scroll fluid device using flexible toothed ring synchronizer |
| 03/21/1990 | EP0359139A2 Vane pump |
| 03/21/1990 | EP0358789A1 Stator for an eccentric worm pump |
| 03/21/1990 | CN2054845U Portable fuel charger |
| 03/20/1990 | US4909714 Pressure balanced external gear pump or motor of floating shaft type |
| 03/14/1990 | EP0358245A1 Sewage transporting device |
| 03/13/1990 | US4907954 Multiple lobed piston pump with angularly and axially displaced segments and throttle valve |
| 03/13/1990 | US4907906 Pin joint for eccentric worm pumps |
| 03/13/1990 | CA1266584A1 Internal gear device with improved rotary valve |
| 03/08/1990 | WO1990002248A1 Synchronizing and unloading system for scroll fluid device |
| 03/08/1990 | DE3829679A1 Metering distributor pump for an internal combustion engine |
| 03/07/1990 | EP0240491B1 Rotary engine |
| 03/07/1990 | CN2054092U Water pump |
| 03/06/1990 | US4905535 Gear wheel mechanism |
| 02/21/1990 | CN2053259U Roller pump |
| 02/20/1990 | US4902202 Variable discharge gear pump with energy recovery |
| 02/15/1990 | DE3916623A1 Rotary hydraulic pump or motor - has coupling wobble bar of larger dia. than opening in rotary valve |
| 02/14/1990 | CN2052829U Automatically spreading impeller ultra low speed oil pump |
| 02/08/1990 | DE3826668A1 Eccentric worm for screw pumps, and method for manufacturing it |
| 02/07/1990 | EP0353553A2 Method of manufacturing stators for eccentric spiral pumps |
| 02/06/1990 | US4898521 Oil feeding system for scroll compressor |
| 01/30/1990 | US4897025 Gerotor pump with extended inlet port |
| 01/30/1990 | US4896633 Valve control of internal combustion engines by means of a rotary piston pump with unequal pumping output |
| 01/24/1990 | EP0351996A2 Hydraulic devices |
| 01/18/1990 | DE3821800A1 Hydraulic motor, in particular oil-pressure motor |
| 01/18/1990 | DE3249829C2 Parallel and internal axis rotary piston engine |
| 01/17/1990 | CN1006490B Self-supporting gear oil pump |
| 01/16/1990 | US4893997 Internal-gear machine |
| 01/10/1990 | CN2050887U Variable quantity paddle pump |
| 01/04/1990 | DE3821841A1 Gear pump |
| 01/02/1990 | US4890990 Rotary internal combustion engine with mutually interengaging rotatable elements |
| 12/28/1989 | WO1989012730A1 Scroll fluid device using flexible toothed ring synchronizer |
| 12/27/1989 | EP0347738A2 Constant radial clearance gerotor design |
| 12/27/1989 | CN2050097U 齿轮液压泵 Gear pumps |
| 12/20/1989 | CN2049697U Volume pump with single-shaft and eccentric rotor |
| 12/20/1989 | CN2049696U Hole-pin type planet cycloidal hydraulic motor |