US PATENT SUBCLASS 196 / 108
.~.~ Cyclic circulation

Current as of: June, 1999
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196 /   HD   MINERAL OILS: APPARATUS

104  DF  VAPORIZING {22}
107  DF  .~ Tube and drum {1}
108.~.~ Cyclic circulation {1}
109  DF  .~.~.~> Drum above tube

DEFINITION

Classification: 196/108

(under subclass 107) Vaporizers, having a means for returning the oil from the drum back to the tube for retreatment.