US PATENT SUBCLASS 417 / 138
.~.~.~ Control by liquid level sensing means

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}
137  DF  .~.~ Cyclic pumping {5}
138.~.~.~ Control by liquid level sensing means

DEFINITION

Classification: 417/138

(under subclass 137) Apparatus wherein said means for admitting or ejecting the fluid which is pumped to and from the pumping chamber comprises liquid level sensing means at predetermined liquid level(s).