US PATENT SUBCLASS 202 / 205
.~.~.~.~ Vacuum

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

81  DF  APPARATUS {4}
82  DF  .~ Systems {6}
152  DF  .~.~ Separatory {3}
163  DF  .~.~.~ Still {13}
205.~.~.~.~ Vacuum

DEFINITION

Classification: 202/205

The system is provided with means for producing a vacuum therein.

SEE OR SEARCH CLASS

34, Drying and Gas or Vapor Contact With Solids,

92, for apparatus for contacting solids with a gas under vacuum.

159, Concentrating Evaporators,

17+, 21 and 22+.

196, Mineral Oils: Apparatus,

114,.

201, Distillation: Processes, Thermolytic, 35, for a process for applying differential pressure to the carbonizing zone.

203, Distillation: Processes, Separatory,

73+, and 91+, for a separatory distillation process utilizing

a vacuum and see "SEARCH CLASS" thereunder.

373, Industrial Electric Heating Furnaces,

54, 63, 110+, and 140+, for an electric furnace which is operated under pressure or vacuum.