Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Robert William Beaven0
Michael John Werson0
Date of Patent
June 19, 2007
0Patent Application Number
108399920
Date Filed
May 6, 2004
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A pump including at least three rotors each being provided with a generally helical screw thread, the rotors being mounted for rotation in a housing such that the screw threads of the rotors mesh and rotation of one rotor causes rotation of the other rotor, wherein the pitch of the threads is less than 1.6 times the outer diameter of the rotors or where one of the rotors has a larger outer diameter than the other rotors the outer diameter of the larger diameter rotor.
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