US PATENT SUBCLASS 162 / 34
.~.~.~ Plural diverse digestion of same fibrous material

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}
34.~.~.~ Plural diverse digestion of same fibrous material

DEFINITION

Classification: 162/34

(under subclass 30) Processes in which a charge of fibrous material is subjected to two successive dissimilar chemical treatments.

(1) Note. The dissimilarity may reside in any one or more of the following factors: composition or concentration of the treating medium, the temperature, pressure or time of the treatment, etc.