Patents
Sitemap › F04 - Positive-displacement machines for liquids; Pumps for liquids or elastic fluids › F04C - Rotary-piston, or oscillating-piston, positive-displacement machines for liquids; Rotary-piston, or oscillating-piston, positive-displacement pumps › F04C 2 - Rotary-piston machines or pumps
Patents for F04C 2 - Rotary-piston machines or pumps (14,296)
12/1991
12/31/1991US5076770 Gear pump having improved low temperature operation
12/25/1991CN1057313A Noncircular planetary gear variable-volume hydraulic system,
12/21/1991CA2044942A1 Progressive cavity drive train with elastomeric joint assembly for use in downhole drilling
12/17/1991US5073097 Multi-chamber rotary lobe fluid machine with positive sliding seats
12/12/1991WO1991019101A1 Rotary vane machine with simplified anti-friction positive bi-axial vane motion control
12/12/1991WO1991018826A2 Postmix beverage dispensing system
12/11/1991CN2090439U Improved roller pump
12/10/1991US5071330 Roller-vane hydraulic machine
12/10/1991US5071327 Two speed gerotor motor with centrally located valve and commutator
12/04/1991EP0459741A1 Helical gear pump
12/04/1991EP0459740A1 Helical gear pump and stator
12/04/1991CN2089990U Double direction floating gear pump
12/03/1991US5069608 Vane pump for delivering pasty substances
11/1991
11/28/1991DE4116747A1 Vane cell compressor - has two outlet channels in one of two side parts and several grooves in rotor outer peripheral surface to support outflow
11/28/1991DE4016841A1 Prodn. of screw spindle pump running housing - involves housing insert with cylindrical main bore accommodating drive spindle
11/27/1991EP0457925A1 Working organ of helical-type down-hole drive for hole drilling
11/21/1991EP0457491A1 Gerotor pumps
11/21/1991EP0457490A1 Gerotor pumps
11/21/1991DE4115652A1 Rotary shock compensating device - has radial piston pump to generate pressure to actuate friction ring in two=part flywheel
11/14/1991DE4017165A1 Pump - has electrically driven spindle passing through rotor and stator
11/14/1991DE4014851A1 Screw gear pump with adjustable delivery inlet volume flow - has at least one back pressure valve allowing permanent or periodical escape of flow fraction
11/12/1991US5064452 Gas removable pump for liquid
11/12/1991US5064362 Balanced dual-lobe vane pump with radial inlet and outlet parting through the pump rotor
11/12/1991US5064013 Hydraulically driven electrically powered vehicle with energy recapture
11/06/1991EP0455059A1 Gear pump
11/05/1991US5062776 Commutator for orbiting gerotor-type pumps and motors
10/1991
10/30/1991CN1055795A Energy conversion mechanism for variable gear hydraulic system
10/29/1991US5061160 Two-speed gerotor with spool valve controlling working fluid
10/24/1991DE4012789A1 Sealing vane cell pump - by using oppositely positioned pairs of sealing vanes
10/22/1991CA1290934C Adhesive pump and it's control system
10/16/1991EP0451684A1 Gear pump having improved low temperature operation
10/16/1991EP0451366A1 Suction line connection for a liquid pump
10/16/1991CN2086797U Eddy-type fluid machinery with automatic eccentric regulator
10/16/1991CN1014345B Bicorn rotator pump
10/15/1991US5056994 Hydrostatic rotary piston machine having interacting tooth systems
10/10/1991DE4107720A1 Single rotary vane pump - has valve connected to shaft via sliding bar linkage
10/09/1991EP0451085A2 Screw rotor pump
10/08/1991US5055017 Mechanical pumps
10/02/1991EP0448941A2 Stator for an eccentric screw pump
10/02/1991DE4110392A1 Rotary vane pump for vehicle steering - has compact double rotor with double vanes mounted on drive shaft
10/02/1991DE4109873A1 Deep drawing producing vane pump housing - uses reverse drawing which presses peripheral bead to give sharp edge at flange
10/02/1991CN2085864U Pump with double-body series three screw stems
10/02/1991CN1055043A Gear pump
10/01/1991US5052974 Device for delivering and conveying paste-like substances
09/1991
09/25/1991EP0447766A2 Spinning pump
09/25/1991EP0343166B1 Gear machine (pump or engine)
09/24/1991US5051078 Rotary pump-flowmeter
09/19/1991DE4107704A1 Hydraulic pump inner gearwheel type - has several peripherally distributed outlet apertures closed by plate spring-type outlet valve
09/18/1991CN2084993U Roller pump with planetary bearings
09/12/1991DE4107315A1 Screw spindle pump with conical profile spindle - has geometrical configuration which damps out pressure pulses
09/12/1991DE4104397A1 Internal gear pump without sickle element - incorporates method of dimensioning teeth to give compact design
09/11/1991EP0445584A1 Planetary gear pump or motor and process for radial force compensation
09/11/1991CN2084525U Two-way pumping machine
09/10/1991US5046244 Method for manufacturing stators, in particular extended stators, for pumps or motors with eccentric shafts
09/04/1991EP0444941A1 Improvements in or relating to rotary pumps
09/04/1991CN1054297A Balanced planetary gear pump
09/04/1991CN1013794B Disk-type rotary piston pump
09/03/1991US5044905 Device for minimizing flutter of a filler piece in an internal gear pump
08/1991
08/22/1991WO1991012431A1 Seal device for gear pump
08/22/1991WO1991012430A1 Gear pump or motor
08/21/1991EP0441913A1 Frictionless rotary pump-motor-meter.
08/20/1991US5040950 Power washing apparatus
08/14/1991DE4007858C1 Rotary liquid pump - has pump coupled to block by symmetrically placed fastening screws
08/08/1991DE4003298A1 Hydraulic pump or motor - has electro-viscous fluid seal that is controlled to generate rapid response
08/06/1991US5037283 Vane type positive displacement pump having multiple pump units
08/01/1991DE4006339C1 Stator for eccentric scroll pump - has threaded inside profile, and rubber-elastic insert on metallic partly-threaded cover
08/01/1991DE4002690A1 Control for rotary pump or motor - has geometry of toothed rotor within stator defining pressure cells
07/1991
07/31/1991EP0438892A1 Fuel pumping apparatus
07/31/1991CN2081902U High-temp. gear pump
07/31/1991CN2081885U Total-enclosed verticle eddy fluid machinery
07/24/1991EP0437962A2 Rotary pump
07/24/1991EP0437919A2 Vane type positive displacement pump
07/17/1991CN2080989U Eddy type fluid machinery with spin preventing machinery
07/16/1991US5032069 Rotary position displacement pump or motor
07/10/1991CN2080576U Diaphragm type water pump
07/10/1991CN2080575U Heating screw pump
07/09/1991US5030072 Constant radial clearance gerotor design
07/02/1991US5028221 High pressure hydraulic generator receiver for power transmission
07/02/1991US5027654 Volumetric meter for liquids and/or gases
06/1991
06/27/1991WO1991009201A1 Working organ of helical-type down-hole drive for hole drilling
06/26/1991EP0433576A1 Annular gear pump for internal combustion engines and automatic transmissions
06/26/1991CN2079671U Pump for conveying viscosity medium
06/26/1991CN1052536A Dual-vane three-action fluid machinery
06/19/1991EP0433079A2 Gas removable pump for liquid
06/19/1991EP0433042A2 Degasifying liquid pump
06/19/1991EP0432388A1 Vane pump for the transport of pasty masses, in particular sausage mince
06/19/1991CN2079228U Dual-screw rod hot oil pump
06/18/1991US5024590 Rotary engine of the type having a planetary rotor with rotor and shaft equal rotation
06/18/1991US5024163 Derailment resisting, tractive power railway system
06/16/1991CA2032181A1 Gas removable pump for liquid
06/15/1991CA2030854A1 Vane pump for conveying pasty masses, in particular sausage meat
06/05/1991EP0430789A1 Rotary machine with rolling piston
06/04/1991US5021629 Electric plasma arc powder welded slide layer for rotary fluid pump vane
06/04/1991US5020826 Vehicle suspension system
05/1991
05/29/1991CN1051777A Rotary piston machine seal
05/29/1991CA2029796A1 Rotary machine with a rolling piston
05/28/1991US5018432 Hydrostatic steering device with a radially free floating valve member
05/22/1991EP0428374A1 Positive displacement pump systems
05/21/1991US5017098 Power transmission
05/15/1991EP0427046A1 Vehicle suspension system
1 ... 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 ... 143