US PATENT SUBCLASS 162 / 249
.~.~.~ With heating

Current as of: June, 1999
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162 /   HD   PAPER MAKING AND FIBER LIBERATION

232  DF  APPARATUS {22}
233  DF  .~ Digester {12}
248  DF  .~.~ Forced circulation or percolation of fluid only {1}
249.~.~.~ With heating

DEFINITION

Classification: 162/249

(under subclass 248) Apparatus having means to either maintain or cause a rise in temperature in either stock undergoing treatment or the treating chemical.

(1) Note. The heating means may be in the circulating circuit or in the digester.