US PATENT SUBCLASS 34 / 598
.~.~.~.~.~ And heat retaining material

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}
598.~.~.~.~.~ And heat retaining material

DEFINITION

Classification: 34/598

And heat retaining material:

(under subclass 595) Subject matter including a substance that holds heat for later use.