143425 ⎘
Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
Sub-classes:INTERVENING REINFORCEMENT LINING FOR A MUD MOTOR
#2ROTOR STATOR PUMP
#3FLOW-THROUGH PULSING ASSEMBLY FOR USE IN DOWNHOLE OPERATIONS
#4PROGRESSING CAVITY DEVICES AND ASSEMBLIES FOR COUPLING MULTIPLE STAGES OF PROGRESSING CAVITY DEVICES
#5PROGRESSIVE CAVITY PUMP WITH PUMP RADIALLY WITHIN ELECTRIC MOTOR
#6UNIAXIAL ECCENTRIC SCREW PUMP
#7UNIAXIAL ECCENTRIC SCREW PUMP
#8DISPOSABLE PUMP CARTRIDGE
#9Internal gear machine with helical toothing
#10Progressive cavity pump
#11ROTOR FOR AN ECCENTRIC SCREW PUMP AND METHOD FOR THE MANUFACTURE THEREOF
#12Rotary Machines With Teardrop-Shaped Rotors
#13Rotor unit and eccentric screw pump
#14FLOW-THROUGH PULSING ASSEMBLY FOR USE IN DOWNHOLE OPERATIONS
#15Systems and methods for positive displacement motor diagnostics and failure prediction
#16Fluid transfer device, coating device comprising same, and coating method
#17Eccentric screw pump with a modular design with a compressible stator lining to adjust for wear and/or improve sealing
#18Mud motor or progressive cavity pump with varying pitch and taper
#19Disposable pump cartridge
#20Eccentric-screw pump with concentricity sensor
#21Electric pump
#22Uniaxial eccentric screw pump
#23PROGRESSING CAVITY DEVICES AND ASSEMBLIES FOR COUPLING MULTIPLE STAGES OF PROGRESSING CAVITY DEVICES
#24SCREW COMPRESSOR WITH A SHUNT-ENHANCED COMPRESSION AND PULSATION TRAP (SECAPT)
#25Intelligent oil extraction system using all-metal screw pump
#26Geared volumetric machine
#27Rotor for an eccentric screw pump and method for the manufacture thereof
#28VARIABLE DISPLACEMENT GEROTOR PUMP
#29Flow-through pulsing assembly for use in downhole operations
#30Stator element of a progressive cavity pump and progressive cavity pump
#31Progressive cavity pump for the tintometric industry
#32Cylindrical symmetric volumetric machine with an inlet ventilator
#33HORIZONTAL AND VERTICAL WELL FLUID PUMPING SYSTEM
#34Progressive cavity pump having improved stator dry-running protection
#35Cylindrical symmetric volumetric machine
#36Stator and uniaxial eccentric screw pump
#37Eccentric screw pump with telescoping housing
#38Fixation detecting apparatus to prevent audible sound from emanating from oil pump during oil pump operation state determination
#39WEAR RESISTANT COATINGS CONTAINING PRECIPITATION-HARDENED ALLOY BODIES AND METHODS FOR THE FORMATION THEREOF
#40Synchronized conical screw compressor or pump
#41Retrievable permanent magnet pump
#42Progressing cavity pump and methods of operation
#43Eccentric screw pump
#44Flow-through pulsing assembly for use in downhole operations
#45Shaft slide ring seal arrangement
#46Liquid transport device with decreasing eccentricity of the rotor
#47Axis eccentric screw pump with an increasing diameter rotor with a constant sectional area stator
#48Axis eccentric screw pump with decreasing sectional area of stator with a constant diameter rotor
#49Lobed rotor with circular section for fluid-driving apparatus
#50JETTING DISPENSING SYSTEM INCLUDING FEED BY PROGRESSIVE CAVITY PUMP AND ASSOCIATED METHODS
#51Coupling element for an eccentric screw rotor
#52Screw pump
#53GEAR PUMP BEARING
#54Uniaxial eccentric screw pump
#55Horizontal and vertical well fluid pumping system
#56Bi-helical toothed wheel with variable helix angle and non-encapsulated profile for a hydraulic gear apparatus
#57Brake system and controller for use with a wellhead direct drive
#58Liquid transport device with decreasing pitches
#59Eccentric screw pump
#60Method for operating a multi-phase pump and apparatus therefor
#61Conical screw machine with rotating inner and outer elements that are longitudinally fixed
#62Check valve with internal mass for progressive cavity pumps
#63Screw pump and impeller fan assemblies and method of operating
#64Downhole test signals for identification of operational drilling parameters
#65Uniaxial eccentric screw pump
#66Discharge system
#67Batching/delivering system comprising at least one remotely actuated volumetric batching pump
#68Metal bellows with guide rings
#69Uniaxial eccentric screw pump
#70Tandem thrust bearing with resilient bearing support
#71Eccentric screw pump
#72METHOD AND APPARATUS FOR TRANSPORTING VISCOUS MATERIAL
#73Multiple Pump Arrangement
#74Pump integrated with two independently driven prime movers
#75Method for operating a multi-phase pump and apparatus therefor
#76PLANETARY ROTOR MACHINE WITH SYNCHRONIZING MECHANISM
#77Borehole submersible pump assembly with a drive and a bearing arrangement disposed at opposite ends of a screw pump
#78Divided stator casing
#79Stators for downhole motors, methods for fabricating the same, and downhole motors incorporating the same
#80Progressive cavity pump including a bearing between the rotor and stator
#81Horizontal and vertical well fluid pumping system
#82Long reach spindle drive systems and method
#83Progressing cavity stator with metal plates having apertures with englarged ends
#84Multi-channel, rotary, progressing cavity pump with multi-lobe inlet and outlet ports
#85Uniaxial eccentric screw pump
#86Stators for downwhole motors, methods for fabricating the same, and downhole motors incorporating the same
#87Screw pump and screw rotor
#88Long reach spindle drive systems and method
#89Drive means
#90Enclosed circulation tool for a well
#91Method of calculating pump flow rates and an automated pump control system
#92Cam-actuated centrifugal brake for preventing backspin
#93SAFE BACKSPIN DEVICE
#94Non-tubing deployed well artificial lift system
#95Rotary screw machine of volume type and method of transforming a motion in a volume screw machine
#96Method of transforming a motion in a volume screw machine of rotary type and rotary screw machine
#97Micro-volume dispense pump systems and methods
#98Micro-volume dispense pump systems and methods