US PATENT SUBCLASS 417 / 152
.~.~ Vapor condensation vacuum diffusion type

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.~.~ Vapor condensation vacuum diffusion type {2}
153  DF  .~.~.~> With cooling or heat insulation means
154  DF  .~.~.~> Vertical stack from generator with reverse flow nozzle

DEFINITION

Classification: 417/152

(under subclass 151) Apparatus in which the pump is adapted to be connected to or enclosed within a space which is to be evacuated to a high vacuum, the motive fluid being in the form of a vapor which acts to remove fluid diffusing out of said space, the motive fluid acting to remove the fluid by entrainment and condensation.

(1) Note. The vapor is generally oil or mercury which is generated in a boiler.