US PATENT SUBCLASS 202 / 228
.~.~.~.~ Gas or vapor circulating

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

81  DF  APPARATUS {4}
*  DD  .~ Types {3}
*  DD  .~.~ Autothermic {5}
227  DF  .~.~.~ Quencher {3}
228.~.~.~.~ Gas or vapor circulating

DEFINITION

Classification: 202/228

Receivers for hot distillation residue arranged to cool or quench the residue by circulation through or over it of neutral gas or by generation and/or circulation of steam or other vapor.

SEE OR SEARCH CLASS

110, Furnaces,

229+, for a solid fuel furnace provided with means to release a gas from the fuel.