Featured patents

Downhole Positive Displacement Motor
US 08535028 B2, Sept. 17, 2013, William Emil Groves / Cansonics Inc. (Calgary, Alberta, CA)
A downhole positive displacement motor comprising:…

Eccentric Screw Pump for Mortar
US 08556604 B2, Oct. 15, 2013, Thomas Jeltsch et al. / J. Wagner GmbH (Markdorf, DE)
An apparatus for delivering viscous delivery material using an eccentric screw…

Eccentric-Screw Pump With Replaceable Rotor and Stator
US 08764420 B2, July 1, 2014, Vsevolod Ryvkin et al. / seepex GmbH (Bottrop, DE)
An eccentric-screw pump comprising:…

Progressing Cavity Pump Adapted for Pumping of Compressible Fluids
US 08556603 B2, Oct. 15, 2013, Sigurd Ree / AGR Subsea AS (Straume, NO)
A progressing cavity pump adapted for pumping of a compressible fluid,…

Progressive Cavity Pump Including Inner and Outer Rotors and a Wheel Gear Maintaining an Interrelated Speed Ratio
US 08496456 B2, July 30, 2013, Sigurd Ree / AGR Subsea AS (Straume, NO)
A progressive cavity pump comprising:…

Rotor Drive Mechanism, Eccentric Shaft Sealing Structure, and Pump Apparatus
US 08449275 B2, May 28, 2013, Mikio Yamashita et al. / Heishin Sobi Kabushiki Kaisha (Kobe-shi, JP)
A rotor drive mechanism configured to transfer rotation of an input shaft portion…

Stator for Progressive Cavity Pump/Motor
US 08851867 B2, Oct. 7, 2014, Gareth Thomas / National Oilwell Varco, L.P. (Houston, US)
A stator for a progressive cavity pump or motor, comprising:…

Stator/Rotor Assemblies Having Enhanced Performance
US 08734141 B2, May 27, 2014, John Snyder et al. / Halliburton Energy Services, P.C. (Houston, US)
A method of constructing a stator/rotor assembly, the method comprising:…

Patentorg has 8 documents under Unlike Helical Surfaces on Relatively Wobbling Rotating Member and Encompassing Cylinder Patents.

Other subcategories for category Rotary expansible chamber devices
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