US PATENT SUBCLASS 34 / 489
.~.~.~.~ Reversible flow

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

282  DF  PROCESS {24}
443  DF  .~ Gas or vapor contact with treated material {17}
487  DF  .~.~ Gas or vapor flow directing or control {3}
488  DF  .~.~.~ Flow direction changes during treatment {1}
489.~.~.~.~ Reversible flow {1}
490  DF  .~.~.~.~.~> Timed control

DEFINITION

Classification: 34/489

Reversible flow:

(under subclass 488) Process wherein the direction of flow of the treating gas or vapor onto the treated material is directed to flow substantially opposite to its initial flow direction.

SEE OR SEARCH THIS CLASS, SUBCLASS:

191, for apparatus using reversible gas or vapor flow.