US PATENT SUBCLASS 202 / 93
.~.~.~ Closed kiln

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

81  DF  APPARATUS {4}
82  DF  .~ Systems {6}
91  DF  .~.~ Autothermic {2}
93.~.~.~ Closed kiln {2}
94  DF  .~.~.~.~> With steam generator
95  DF  .~.~.~.~> With residue quencher or cooler

DEFINITION

Classification: 202/93

The kiln is closed and partial combustion of its contents furnishes the heat to distill the remainder. This is the broad subclass for the beehive ovens.