US PATENT SUBCLASS 34 / 137
.~.~.~.~ Countercurrent gas or vapor flow only

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

523  DF  APPARATUS {40}
108  DF  .~ Rotary drums or receptacles {7}
130  DF  .~.~ With gas or vapor flow for contact with treated material {5}
135  DF  .~.~.~ Axial treated material feed type {2}
137.~.~.~.~ Countercurrent gas or vapor flow only

DEFINITION

Classification: 34/137

(under subclass 135) Apparatus in which the gas or vapor that contacts the material is introduced at the material discharge end and is discharged at the material feed end, i.e., the directions of flow of the material being treated and the treating gas and/or vapor are opposite.

SEE OR SEARCH THIS CLASS, SUBCLASS:

135, for this character of gas or vapor flow combined with other characters of flow.