US PATENT SUBCLASS 162 / 87
.~.~ Chlorine containing

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}
87.~.~ Chlorine containing {1}
88  DF  .~.~.~> Plural diverse stage treatments {1}

DEFINITION

Classification: 162/87

(under subclass 70) Processes in which a chlorine containing material is employed.

(1) Note. Many of the patents in this and indented subclasses are directed to the bleaching of fibrous pulps.