US PATENT SUBCLASS 162 / 59
.~.~ Closed circuit circulation

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}
57  DF  .~ With agitation or forced circulation {2}
59.~.~ Closed circuit circulation

DEFINITION

Classification: 162/59

(under subclass 57) Processes in which the fibrous material and/or treating liquid is forced to travel in a closed path by circuit defining elements of the apparatus employed.