| Patents for F04C 2 - Rotary-piston machines or pumps (14,296) |
|---|
| 05/14/1991 | US5015162 Attachment for an oil well screw pump system |
| 05/14/1991 | CA1284084C Apparatus for quantitatively extruding food material |
| 05/14/1991 | CA1284064C Gear pump |
| 05/07/1991 | US5013227 Multistage roots pump and a method of assembling such a pump |
| 05/07/1991 | US5012837 Ratio device for dispensing liquids |
| 05/01/1991 | CN2076174U External-lubricating rotary pump |
| 05/01/1991 | CN2076173U Gear type motor-driven submersible pump |
| 04/30/1991 | US5011386 Rotary positive displacement machine for incompressible media |
| 04/23/1991 | US5009582 Rotary fluid pressure device and improved stationary valve plate therefor |
| 04/23/1991 | US5009212 Port fuel injection and induction system for internal combustion engine |
| 04/18/1991 | DE4031468A1 Configuration for vane cell pump - involves method of calculating curves for housing cross=section |
| 04/17/1991 | EP0422617A1 Suction regulated annular gear pump |
| 04/17/1991 | CN2075266U Improved portable engine oil drawing pump for car |
| 04/16/1991 | US5007490 Progressive cavity drive train with elastomeric joint assembly for use in downhole drilling |
| 04/10/1991 | CN2074831U Cycloid rotator lubricating pump |
| 04/10/1991 | CN2074830U Portable automobile oil machine sucktion |
| 04/09/1991 | US5006053 Vertical single blade rotary pump |
| 04/09/1991 | CA1282754C Scroll type fluid displacement apparatus with centrifugal force balanceweight |
| 04/05/1991 | WO1991005144A1 Rotary piston machine seal |
| 04/05/1991 | CA2067345A1 Rotary piston machine seal |
| 04/04/1991 | DE4028699A1 Sickle-shaped flexible filler elements - is for gear pump and makes use of loop joint to connect two flanks |
| 04/03/1991 | CN2074382U Automatic control flow direction cycloidal rotary lubricating pump |
| 04/02/1991 | US5004409 Displacement machine |
| 04/02/1991 | US5004352 Plasticizing screw |
| 03/28/1991 | DE4015984A1 Eccentrically controlled rotary piston pump - uses eccentric spindle to control piston movement also suction and compression operations |
| 03/27/1991 | CN2073946U Helical blade type mud pump |
| 03/26/1991 | CA1281891C Method of manufacturing rotor for rotary fluid pumps |
| 03/20/1991 | CN2073493U 圆弧齿轮泵 Arc gear pump |
| 03/13/1991 | CN1011996B Fluid flowmeter |
| 02/27/1991 | EP0363420B1 Pump |
| 02/20/1991 | CN2071717U Constant power adjustable-speed gear pump |
| 02/13/1991 | EP0412403A2 Rotary fluid pressure device and improved stationary valve plate therefor |
| 02/13/1991 | CN1011610B Alternative stepped hydraulic prime mover and pump |
| 02/12/1991 | US4992034 Low-speed, high-torque gerotor motor and improved valving therefor |
| 02/12/1991 | US4991292 Method of producing elastomeric stators for eccentric helical pumps |
| 02/06/1991 | EP0411000A1 A method for manufacturing screw rotors. |
| 02/06/1991 | EP0220187B1 Flow regulating device for a rotary piston pump |
| 02/05/1991 | WO1991002154A1 Improved commutator for orbiting gerotor-type pumps and motors |
| 02/05/1991 | US4990074 Oil pump having pivoting vanes |
| 02/05/1991 | US4990070 Rotary screw pump with suction vanes at intake port |
| 02/05/1991 | CA2064735A1 Commutator for orbiting gerotor-type pumps and motors |
| 01/24/1991 | WO1991000964A1 Frictionless rotary pump-motor-meter |
| 01/23/1991 | CN2069936U Positive displacement rotary pump with helical curved surface dies cavity |
| 01/22/1991 | US4986739 Gerotor pump having axial fluid transfer passages through the lobes |
| 01/22/1991 | CA1279301C Rotary type fluid machine |
| 01/17/1991 | DE3939649A1 Internally meshing gear pump - makes use of spring pressure forces to reduce pulsations |
| 01/16/1991 | EP0408011A1 Gerotor motor and improved pressure balancing therefor |
| 01/16/1991 | CN2069495U Non-circular gear planet variable capacity hydraulic device |
| 01/15/1991 | US4984975 Rotary pump with cutting means |
| 01/15/1991 | CA1278954C Electrical commutation apparatus |
| 01/10/1991 | DE4018509A1 Vane cell pump with vanes in axial slots - uses method of connecting rotor to bearing shaft |
| 01/10/1991 | DE3921735A1 Vane cell pump with several pressure connections - incorporates system for altering size of vane cells |
| 01/09/1991 | CN2069040U Multi-disc type gear pump |
| 01/09/1991 | CN2069039U Rotary-piston pump having floating rolls |
| 01/08/1991 | CA1278782C Axial thrust load mechanism for a scroll type fluid displacement apparatus |
| 01/08/1991 | CA1278724C Displacement pump |
| 01/05/1991 | CA2018027A1 Frictionless rotary pump-motor-meter |
| 01/02/1991 | EP0405160A1 Screw rotor pump |
| 01/01/1991 | US4981422 Gerotor device having a valve opening diameter smaller than the drive connection diameter |
| 12/27/1990 | EP0294399B1 Swivelling vane pump |
| 12/26/1990 | CN1010967B Oil-allocation type gear pump |
| 12/12/1990 | EP0193618B1 Apparatus and method for assembling and matching the working components of a sectional screw downhole motor |
| 12/12/1990 | CN2067332U Multibladed cam liquid transfer pump |
| 12/11/1990 | US4976595 Trochoid pump with radial clearances between the inner and outer rotors and between the outer rotor and the housing |
| 12/11/1990 | US4976594 Gerotor motor and improved pressure balancing therefor |
| 12/05/1990 | CN1047551A Power transmission |
| 12/04/1990 | USRE33473 Oil feeding device for scroll fluid apparatus |
| 11/28/1990 | EP0399387A2 Rotary vane machine |
| 11/28/1990 | CN2066515U Energy conversion mechanism for variable gear type hydraulic system |
| 11/27/1990 | US4973408 Water purification and desalinaiton |
| 11/22/1990 | EP0398377A2 Rotary hydraulic machine |
| 11/22/1990 | EP0398053A1 Vane pump for foodstuffs in paste form |
| 11/22/1990 | EP0398020A2 Internal gear pump |
| 11/22/1990 | DE3916155A1 Internally-toothed gear pump |
| 11/20/1990 | US4971536 Rotor for fluidic apparatus |
| 11/20/1990 | US4971535 Tandem rotary pump with pressure chamber between two intermediate side plates |
| 11/14/1990 | CN2065685U Roll pump for ceramic sprayed coating |
| 11/13/1990 | US4969806 Aggregate for feeding fuel from supply tank to internal combustion engine of a power vehicle |
| 11/07/1990 | EP0258393A4 Adhesive dispensing pump control system and pump |
| 11/07/1990 | CN1046779A Low-speed, high-torque gerotor motor and improved valving therefor |
| 11/07/1990 | CN1010337B Large internally tangent arc unloading vane-type pump or motor |
| 11/06/1990 | US4968233 Hydraulic gear motor |
| 11/06/1990 | CA1275859C Closed center hydraulic devide |
| 10/31/1990 | EP0394821A2 Valve for gerotor motor |
| 10/31/1990 | DE4012929A1 Gear pump for delivering plastics melts - has groove4 in teeth of gears |
| 10/31/1990 | DE3935741A1 Fluid or fluent material doser - has pipes connected to hollow cylinder and leading to supply container and filling arrangement |
| 10/31/1990 | CN2064832U Middle axial compensationally sealed gear pump |
| 10/23/1990 | US4964864 Heart assist pump |
| 10/18/1990 | DE3911903A1 Displacement pump for liq. - uses C=shaped pumping member performing orbiting motion inside C=shaped chamber |
| 10/17/1990 | EP0392230A2 Internal axis rotary piston machine |
| 10/17/1990 | CN1046208A Gate type hydraulic pump (motor) |
| 10/16/1990 | US4963080 Rotary hydraulic vane machine with cam-urged fluid-biased vanes |
| 10/10/1990 | EP0391288A2 Pumping apparatus |
| 10/03/1990 | EP0389838A2 Housing for rotary pump |
| 09/27/1990 | DE3909259A1 Hydraulic motor with axial working connections |
| 09/26/1990 | EP0388625A2 Conveying device for pasty products |
| 09/26/1990 | EP0323979A4 Rotary machine |
| 09/26/1990 | CN1045628A Power transmission |
| 09/25/1990 | US4958996 For interacting with a flow of liquid |
| 09/25/1990 | US4958994 Gear Machine for a pump or engine having bearing members with circumferential relief grooves |