Screw pump

Details Screw pump Screw pump

2007-06-19

2007-06-19

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

Interengaging rotating members

Three or more

C418S180000

Reexamination Certificate

active

10839992

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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United Kingdom Search Report issued in connection with priority application GB 030591.3.
United Kingdom Search Report issued in connection with priority application GB 0310592.1.
European Search Report of Jul. 27, 2004 issued in connection with corresponding European application.

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