US PATENT SUBCLASS 417 / 94
.~.~.~ Helical chamber

Current as of: June, 1999
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417 /   HD   PUMPS

65  DF  ONE FLUID PUMPED BY CONTACT OR ENTRAINMENT WITH ANOTHER {10}
92  DF  .~ Liquid piston {6}
93  DF  .~.~ Moving contracting chamber {5}
94.~.~.~ Helical chamber

DEFINITION

Classification: 417/94

(under subclass 93) Apparatus in which said chamber has a wall means having a spiral configuration which extends along an axis, and upon rotation about said axis said wall means is caused to move relative to said liquid surface, move said fluid axially and change the pressure of said fluid to be pumped which is confined in said chamber.