US PATENT SUBCLASS 34 / 488
.~.~.~ Flow direction changes during treatment

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.~.~.~ Flow direction changes during treatment {1}
489  DF  .~.~.~.~> Reversible flow {1}

DEFINITION

Classification: 34/488

Flow direction changes during treatment:

(under subclass 487) Process wherein the point of application of the treating gas or vapor is varied or changed during treatment.