US PATENT SUBCLASS 162 / 38
.~.~.~ With addition of chemicals prior to reuse

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}
37  DF  .~.~ Digestion fluid reused on different fibrous materials {2}
38.~.~.~ With addition of chemicals prior to reuse {1}
39  DF  .~.~.~.~> In digester

DEFINITION

Classification: 162/38

(under subclass 37) Processes which include the addition of chemicals other than water or steam, to waste liquor, prior to reuse thereof.

(1) Note. The purpose of the addition of chemicals to the used digestion fluid is of no significance. Thus, addition may be for the removal of impurities, as well as for enhancing the chemical activity of the liquor during subsequent use.

(2) Note. The added chemicals, of the above definition, may be previously unused materials or other regenerated waste liquor, as well as any other material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

45, for the addition of fresh chemicals to digestion fluid while moving in a closed circuit to and from the same fibrous mass.