US PATENT SUBCLASS 202 / 222
.~.~.~.~ Structural features

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

81  DF  APPARATUS {4}
*  DD  .~ Types {3}
*  DD  .~.~ Autothermic {5}
217  DF  .~.~.~ Retort {6}
222.~.~.~.~ Structural features {3}
223  DF  .~.~.~.~.~> Wall
224  DF  .~.~.~.~.~> Shields
225  DF  .~.~.~.~.~> Cores

DEFINITION

Classification: 202/222

The claims are directed to features of retort structure or shape.