US PATENT SUBCLASS 34 / 578
.~.~ Having tubular heat exchanger

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

523  DF  APPARATUS {40}
576  DF  .~ With fluid current conveying of treated material {12}
578.~.~ Having tubular heat exchanger

DEFINITION

Classification: 34/578

Having tubular heat exchanger:

(under subclass 576) Subject matter wherein the fluidly conveyed material contacts a pipe filled with a heat transfer material.