US PATENT SUBCLASS 162 / 36
.~.~.~ Sulfur dioxide or sulfite containing spent liquor

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}
29  DF  .~ With regeneration, reclamation, reuse, recycling or destruction of digestion fluid {3}
30.1  DF  .~.~ With destruction of organic ingredient in or smelting of liquor {7}
36.~.~.~ Sulfur dioxide or sulfite containing spent liquor

DEFINITION

Classification: 162/36

(under subclass 30) Processes in which the waste liquor from a cellulose digestion with a sulfite or sulfur dioxide is subjected to smelting or the destruction of a contained organic material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

83+, for processes of digesting or treating cellulosic fibrous material with a sulfite or sulfur dioxide.