US PATENT SUBCLASS 202 / 250
.~.~.~ Top

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

81  DF  APPARATUS {4}
239  DF  .~ Elements {10}
242  DF  .~.~ Closures {5}
250.~.~.~ Top {1}
251  DF  .~.~.~.~> Charging

DEFINITION

Classification: 202/250

Devices to close the tops of vertical retorts, ovens or stills.

SEE OR SEARCH CLASS

48, Gas: Heating and Illuminating,

76,.

266, Metallurgical Apparatus,

184, for furnaces having bell and hopper type charging structure and subclass 199, for shaft furnaces having specific top structure.