Sealing apparatus for a gear ball joint

Segmented stator for progressive cavity transducer

Speed changer for in-hole motors

Stator assembly for a progressing cavity pump

Stator casing for eccentric worm pumps

Stator clamping device for eccentric screw pump

Stator especially adapted for use in a helicoidal pump/motor

Stator for a downhole fluid operated motor and method of assembl

Stator for an eccentric screw pump or an eccentric worm...

Stator for an eccentric screw pump or an eccentric worm...

Stator for an eccentric screw pump or an eccentric worm...

Stator for down hole drilling motor

Stator for eccentric spiral pump

Stator for eccentric spiral pump

Stator for eccentric worm pumps

Stator system

Stator with rigid retaining ring

Surface treatment of helically-profiled rotors

Uniaxial eccentric screw pump having a flexible plastic shaft

Universal joint and progressive cavity transducer using the same