US PATENT SUBCLASS 417 / 122
.~.~ Alternate pumping from plural 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}
122.~.~ Alternate pumping from plural pumping chambers {1}
123  DF  .~.~.~> Motive fluid in one chamber controlled by condition in second chamber {2}

DEFINITION

Classification: 417/122

(under subclass 118) Apparatus comprising plural pumping chambers interrelated by means to effect alternate pumping from said chambers.