US PATENT SUBCLASS 417 / 153
.~.~.~ With cooling or heat insulation 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}
151  DF  .~ Jet {23}
152  DF  .~.~ Vapor condensation vacuum diffusion type {2}
153.~.~.~ With cooling or heat insulation means

DEFINITION

Classification: 417/153

(under subclass 152) Apparatus in which means are provided to cool the pump, usually the outer walls or nozzle thereof or heat insulation means are provided to prevent heat transfer from the motive fluid to the zone being evacuated.