US PATENT SUBCLASS 34 / 228
.~.~.~.~ Countercurrent to treated material motion 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}
227  DF  .~.~.~ Gas or vapor flow toward or from treated material entrance or exit {1}
228.~.~.~.~ Countercurrent to treated material motion only

DEFINITION

Classification: 34/228

(under subclass 227) Apparatus in which the gas and/or vapors that contact the material have opposite directions of flow only.