US PATENT SUBCLASS 202 / 109
.~.~.~.~ With cyclic volatile circulation

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

81  DF  APPARATUS {4}
82  DF  .~ Systems {6}
96  DF  .~.~ Thermolytic {5}
105  DF  .~.~.~ Retort {14}
109.~.~.~.~ With cyclic volatile circulation

DEFINITION

Classification: 202/109

The volatile matter distilled off is moved in a closed circuit through the retort, with or without intermediate purification.

SEE OR SEARCH CLASS

201, Distillation: Processes, Thermolytic,

28+, for a process of thermolytic distillation including removing, treating and recycling a product and subclass 43, for a digest of heating by cyclically circulating a hot, extraneous, inert gas.