US PATENT SUBCLASS 162 / 71
.~.~ Treatment of ground-wood or sawdust

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

1  DF  PROCESSES OF CHEMICAL LIBERATION, RECOVERY OR PURIFICATION OF NATURAL CELLULOSE OR FIBROUS MATERIAL {33}
70  DF  .~ Treatment with particular chemical {9}
71.~.~ Treatment of ground-wood or sawdust

DEFINITION

Classification: 162/71

(under subclass 70) Processes in which the fibrous material being treated includes groundwood or sawdust.