US PATENT SUBCLASS 162 / 7
.~.~ With sulfur or sulfur compound

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}
4  DF  .~ Waste paper or textile waste {4}
7.~.~ With sulfur or sulfur compound

DEFINITION

Classification: 162/7

(under subclass 4) Processes in which elemental sulfur or a sulfur compound is employed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

82, for processes of digesting or treating nonwaste or unused cellulose with sulfur or a sulfur-containing material.