US PATENT SUBCLASS 162 / 65
.~.~ Oxygen, ozone or air

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}
65.~.~ Oxygen, ozone or air

DEFINITION

Classification: 162/65

(under subclass 63) Processes in which the gas or vapor is oxygen, ozone or air.

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69, for processes of fiber digestion or treatment by percolating the treating fluid therethrough, even though the fibrous material may contact the ambient air.