US PATENT SUBCLASS 34 / 220
.~.~.~.~ Caused by heater action only

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}
218  DF  .~.~ With gas or vapor circulation for contact with treated material {8}
219  DF  .~.~.~ Recirculation of treating gas or vapor {5}
220.~.~.~.~ Caused by heater action only

DEFINITION

Classification: 34/220

(under subclass 219) Apparatus in which the recirculation is caused by the heater only.

SEE OR SEARCH THIS CLASS, SUBCLASS:

78,

234, for gas or vapor flow caused by heater action, without recirculation.