US PATENT SUBCLASS 417 / 258
.~.~ Reciprocating cylinder and piston

Current as of: June, 1999
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417 /   HD   PUMPS

244  DF  SUCCESSIVE STAGES {8}
254  DF  .~ Reciprocating rigid stages {8}
258.~.~ Reciprocating cylinder and piston

DEFINITION

Classification: 417/258

(under subclass 254) Apparatus in which one of the pumping members comprises a piston which reciprocates in a fixed cylinder and another pumping member comprises a cylinder which moves with respect to a fixed piston encompassed thereby.