US PATENT SUBCLASS 417 / 254
.~ Reciprocating rigid stages

Current as of: June, 1999
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417 /   HD   PUMPS

244  DF  SUCCESSIVE STAGES {8}
254.~ Reciprocating rigid stages {8}
255  DF  .~.~> Crankcase forms stage or interstage flow path
256  DF  .~.~> Stages comprise oppositely moving valved pumping members {1}
258  DF  .~.~> Reciprocating cylinder and piston
259  DF  .~.~> Including valved piston {5}
265  DF  .~.~> Relatively movable
266  DF  .~.~> Three or more
267  DF  .~.~> Series double acting
268  DF  .~.~> Unidirectionally acting rigidly connected pumping members

DEFINITION

Classification: 417/254

(under subclass 244) Apparatus in which the successive pumping units each include a rigid pumping member which partakes of a to-and- fro movement to perform the pumping function.

(1) Note. The stages may be formed by the opposite faces of a unitary pumping member.

(2) Note. This definition excludes pumping members of the flexible wall type.