US PATENT SUBCLASS 203 / 77
.~.~.~ Initial distillation under positive pressure or vacuum

Current as of: June, 1999
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203 /   HD   DISTILLATION: PROCESSES, SEPARATORY

71  DF  PLURAL DISTILLATIONS PERFORMED ON SAME MATERIAL {5}
73  DF  .~ One a distillation under positive pressure or vacuum {4}
74  DF  .~.~ Distillation of initial distillate {3}
77.~.~.~ Initial distillation under positive pressure or vacuum

DEFINITION

Classification: 203/77

(under subclass 74) Processes in which the initial distillation is carried out under a pressure greater than atmospheric or under a vacuum.