US PATENT SUBCLASS 34 / 170
.~.~.~ Inverted imperforate ducts

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

523  DF  APPARATUS {40}
165  DF  .~ Gravity flow type {7}
168  DF  .~.~ With gas or vapor flow for contact with treated material {4}
170.~.~.~ Inverted imperforate ducts

DEFINITION

Classification: 34/170

(under subclass 168) Apparatus in which the treating gas or vapor is distributed into contact with the material by imperforate members of generally inverted "V" or "U" configuration.