US PATENT SUBCLASS 162 / 93
.~.~ Bark

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}
91  DF  .~ Particular raw cellulosic materials {8}
93.~.~ Bark

DEFINITION

Classification: 162/93

(under subclass 91) Processes directed to the digestion or chemical treatment of the tissues of the woody stem which are outside the cambium layer of the plant, that is the bark.