US PATENT SUBCLASS 162 / 41
.~.~ Recirculation (includes separation from fibers)

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.~.~ Recirculation (includes separation from fibers) {2}
42  DF  .~.~.~> With treatment of fluids during recirculation {2}
46  DF  .~.~.~> Steam only

DEFINITION

Classification: 162/41

(under subclass 29) Processes in which the used fiber liberation or treating agent is separated from the fibrous mass and returned and reused on the same fibrous material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

248, for digesters with fluid circulation means.