US PATENT SUBCLASS 34 / 606
.~.~.~.~.~.~ And gas or vapor flow regulating means

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}
132  DF  .~.~.~ With heating means {2}
595  DF  .~.~.~.~ With drum or receptacle enclosing housing {9}
604  DF  .~.~.~.~.~ Including gas or vapor circulating means {6}
606.~.~.~.~.~.~ And gas or vapor flow regulating means

DEFINITION

Classification: 34/606

And gas or vapor flow regulating means:

(under subclass 604) Subject matter also including a means to control or direct the gas or vapor flow such as a valve, shutter, damper, diverter, etc.