Rotary expansible chamber devices – Interengaging rotating members – Three or more
Reexamination Certificate
2007-06-26
2007-06-26
Trieu, Theresa (Department: 3748)
Rotary expansible chamber devices
Interengaging rotating members
Three or more
C418S201100
Reexamination Certificate
active
11269077
ABSTRACT:
A pump including a power rotor and an idler rotor, the rotors each being provided with a generally helical screw thread and 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, the power rotor being connected to a driving means operation of which causes rotation of the power rotor, wherein the pitch of the threads is less than 1.6 times the outer diameter of the power rotor, the depth of the threads is less than or equal to 0.2 times the outer diameter of the power rotor, and the root diameter of the idler rotor is less than 0.31 times the outer diameter of the power rotor.
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United Kingdom Search Report issued in priority application GB 0424557.7.
Beaven Robert William
Werson Michael John
Automotive Motion Technology Limited
Dykema Gossett PLLC
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