US PATENT SUBCLASS 162 / 68
.~.~ Steam only

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}
63  DF  .~ Gas, vapor or mist contact {4}
68.~.~ Steam only

DEFINITION

Classification: 162/68

(under subclass 63) Processes in which steam is the only gas or vapor coming into direct contact with the fibrous material.