US PATENT SUBCLASS 417 / 263
.~.~.~ With additional pumping member in parallel flow path

Current as of: June, 1999
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417 /   HD   PUMPS

244  DF  SUCCESSIVE STAGES {8}
254  DF  .~ Reciprocating rigid stages {8}
259  DF  .~.~ Including valved piston {5}
263.~.~.~ With additional pumping member in parallel flow path

DEFINITION

Classification: 417/263

(under subclass 259) Apparatus in which in addition to the successive pumping units including the valved piston another pumping member is provided which pumps fluid in parallel with said units; i.e., the fluid pumped by the pumping member does not pass through the pumping units.

(1) Note. The additional pumping member maybe an element of a second multistage pump unit.