US PATENT SUBCLASS 162 / 64
.~.~ Sulfur dioxide

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}
64.~.~ Sulfur dioxide

DEFINITION

Classification: 162/64

(under subclass 63) Processes in which the gas or vapor is sulfur dioxide.

SEE OR SEARCH THIS CLASS, SUBCLASS:

83+, for processes of digestion or treatment of fibrous material with a sulfite or sulfur dioxide (not involving gas-fiber contact).