US PATENT SUBCLASS 417 / 256
.~.~ Stages comprise oppositely moving valved pumping members

Current as of: June, 1999
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417 /   HD   PUMPS

244  DF  SUCCESSIVE STAGES {8}
254  DF  .~ Reciprocating rigid stages {8}
256.~.~ Stages comprise oppositely moving valved pumping members {1}
257  DF  .~.~.~> Aligned

DEFINITION

Classification: 417/256

(under subclass 254) Apparatus in which the pumping members are constrained to move in opposite directions, the pumping members containing valves and the pump fluid passing successively through the members.