US PATENT SUBCLASS 202 / 233
.~.~.~.~ Directly and indirectly heated

Current as of: June, 1999
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202 /   HD   DISTILLATION: APPARATUS

81  DF  APPARATUS {4}
*  DD  .~ Types {3}
*  DD  .~.~ Separatory {1}
232  DF  .~.~.~ Still {6}
233.~.~.~.~ Directly and indirectly heated

DEFINITION

Classification: 202/233

Single stills with heating furnace, tube, jacket, or other means of heating its contents without contact of heating fluid and contents and also means for introducing heating fluid directly to the interior of the still.