US PATENT SUBCLASS 417 / 86
.~.~ Including pneumatic displacement


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}
86.~.~ Including pneumatic displacement


DEFINITION

Classification: 417/86

(under subclass 85) Apparatus in which one of the pumps is of the type having a chamber or container in which liquid to be pumped is collected and means to apply gas pressure from an external source to the surface of the liquid in said chamber or container to expel the liquid therefrom.

(1) Note. The gas pressure may be merely atmospheric air admitted to the chamber which has been filled by applying vacuum thereto.