US PATENT SUBCLASS 417 / 121
.~.~ Serially connected pumping chambers

Current as of: June, 1999
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417 /   HD   PUMPS

65  DF  ONE FLUID PUMPED BY CONTACT OR ENTRAINMENT WITH ANOTHER {10}
118  DF  .~ Liquid pumped by supplying or exhausting gaseous motive fluid to or from pumping chamber {7}
121.~.~ Serially connected pumping chambers

DEFINITION

Classification: 417/121

(under subclass 118) Apparatus comprising plural pumping chambers where the liquid output of one chamber is the liquid input for another.