Positive displacement pump apparatus and method

Details Positive displacement pump apparatus and method Positive displacement pump apparatus and method

2011-08-30

2011-08-30

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

Interengaging rotating members

Like rotary members

C418S132000, C418S141000, C418S206600, C418S206700, C418S206800

Reexamination Certificate

active

08007264

ABSTRACT:
An improved positive displacement rotary pump apparatus and method is provided. The pump may include a front cover, a rotor body forming a chamber with the front cover, a gear case supporting a pair of hollow drive shafts, and a pair of rotors disposed in the chambers and each detachably mounted to one end of a respective hollow drive shaft via a stud that extends from the rotor through the hollow shaft to a fastener.

REFERENCES:
patent: 4293290 (1981-10-01), Swanson
patent: 5370514 (1994-12-01), Morita et al.
patent: 5924855 (1999-07-01), Dahmlos et al.
patent: 6328547 (2001-12-01), Morita
patent: 6758660 (2004-07-01), Kriehn et al.
patent: 444941 (1991-09-01), None
patent: 05164076 (1993-06-01), None

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