Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
July 21, 2009
Patent Application Number
11405525
Date Filed
April 18, 2006
Patent Primary Examiner
Patent abstract
An improved pump and pumping method includes a circumferential positive displacement pump having two counter rotating rotors. A clearance gap is defined between the rotor shaft, and a body hub portion of the body that forms the chamber.
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