US PATENT SUBCLASS 34 / 490
.~.~.~.~.~ Timed control

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  DF  .~.~.~.~ Reversible flow {1}
490.~.~.~.~.~ Timed control

DEFINITION

Classification: 34/490

Timed control:

(under subclass 489) Process wherein the treating gas or vapor flow is reversed under the control or influence of a clock.