Adjustable pressure extrusion pump

Apparatus for discharging material

Asymmetric contouring of elastomer liner on lobes in a...

Attachment for an oil well screw pump system

Axial flow apparatus with rotating helical chamber and spindle m

Carbide or boride coated rotor for a positive displacement motor

Casing of an eccentric worm pump designed to burst at preselecte

Combined pump with rotodynamic impeller

Compact eccentric screw pump

Composite stator construction for downhole drilling motors

Down hole motor

Downhole motor seal and method

Downhole progressive cavity type drilling motor with flexible co

Downhole rotary motor with sealed thrust bearing assembly

Drive arrangement

Drive arrangement for progressing cavity pump

Drive arrangement for progressing cavity pump

Eccentric archimedian screw pump of rotary displacement type

Eccentric disc pump

Eccentric screw pump