US PATENT SUBCLASS 162 / 42
.~.~.~ With treatment of fluids during recirculation

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}
41  DF  .~.~ Recirculation (includes separation from fibers) {2}
42.~.~.~ With treatment of fluids during recirculation {2}
43  DF  .~.~.~.~> Removal and/or separation of portion of recirculating fluid {1}
45  DF  .~.~.~.~> With addition of chemicals to recirculating fluid

DEFINITION

Classification: 162/42

(under subclass 41) Processes in which some property of the digestion fluid is altered during the circulation thereof.

(1) Note. Many of the patents appearing in this subclass involve heating the digestion fluid during circulation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

249, for digesters, combined with means for recirculating the digestion fluid and means for heating the fluid during recirculation.