US PATENT SUBCLASS 417 / 81
.~.~.~.~ Multiple-stage rotary pump

Current as of: June, 1999
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417 /   HD   PUMPS

65  DF  ONE FLUID PUMPED BY CONTACT OR ENTRAINMENT WITH ANOTHER {10}
76  DF  .~ Jet pump with motive fluid generating pump {4}
79  DF  .~.~ Jet delivers back to generating pump {1}
80  DF  .~.~.~ Rotary nonexpansible chamber-type generating pump {3}
81.~.~.~.~ Multiple-stage rotary pump

DEFINITION

Classification: 417/81

(under subclass 80) Apparatus in which the rotary nonexpansible chamber-type pump includes a plurality of rotary pumping members at least a portion of the pumped fluid passing successively from one pumping member to the next.