US PATENT SUBCLASS 203 / 73
.~ One a 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.~ One a distillation under positive pressure or vacuum {4}
74  DF  .~.~> Distillation of initial distillate {3}
78  DF  .~.~> And returning distillation product to a previous distillation zone
79  DF  .~.~> Including the addition of water or steam
80  DF  .~.~> Initial distillation under positive pressure or vacuum

DEFINITION

Classification: 203/73

(under subclass 71) Processes in which at least one distillation operation is carried out under a pressure greater than atmospheric or under a vacuum.

SEE OR SEARCH THIS CLASS, SUBCLASS:

43, for a distillation separatory process in which the initial residue is extracted with a liquid.

91+, for a single distillation process carried out at a pressure greater or less than atmospheric pressure and see "SEARCH CLASS" under subclass 91 for related fields of search.

SEE OR SEARCH CLASS

202, Distillation: Apparatus,

205, for a separatory distillation system provided with means for producing a vacuum therein.