US PATENT SUBCLASS 34 / 212
.~.~.~.~ Recirculation of treating gas or vapor

Current as of: June, 1999
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34 /   HD   DRYING AND GAS OR VAPOR CONTACT WITH SOLIDS

523  DF  APPARATUS {40}
201  DF  .~ Houses, kilns, and containers {6}
209  DF  .~.~ Plural treating units or compartments {1}
210  DF  .~.~.~ With gas or vapor circulation for contact with treated material {5}
212.~.~.~.~ Recirculation of treating gas or vapor {1}
213  DF  .~.~.~.~.~> Parallel circulation only

DEFINITION

Classification: 34/212

(under subclass 210) Apparatus including means to recirculate the treating gas or vapor in whole or part.

(1) Note. See (1) Note to subclasses 219+, this class, for other gas or vapor recirculation.

(2) Note. This subclass does not include the reuse of the gas or vapor in successive compartments or units without recirculation through each or through two or more.