US PATENT SUBCLASS 417 / 90
.~.~ Including aerated column

Current as of: June, 1999
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417 /   HD   PUMPS

65  DF  ONE FLUID PUMPED BY CONTACT OR ENTRAINMENT WITH ANOTHER {10}
85  DF  .~ Diverse pumps {3}
90.~.~ Including aerated column {1}
91  DF  .~.~.~> Diverse pump motor exhaust is aeration fluid

DEFINITION

Classification: 417/90

(under subclass 85) Apparatus in which one of the pumps is of the aerated column type.

(1) Note. For the definition of an aerated column pump see this class subclass 108.