US PATENT SUBCLASS 202 / 91
.~.~ Autothermic

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

81  DF  APPARATUS {4}
82  DF  .~ Systems {6}
91.~.~ Autothermic {2}
92  DF  .~.~.~> Open kiln
93  DF  .~.~.~> Closed kiln {2}

DEFINITION

Classification: 202/91

Systems in which the kilns or chambers in which the destructive distillation occurs are heated by chemical change (as combustion) of the distilland itself.