US PATENT SUBCLASS 162 / 57
.~ With agitation or forced 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.~ With agitation or forced circulation {2}
58  DF  .~.~> In rotating vessel
59  DF  .~.~> Closed circuit circulation

DEFINITION

Classification: 162/57

(under subclass 1) Processes which include imparting to the

fibrous material and/or fluid treating agent some positive motion during the treating or digestion operation.

(1) Note. Agitation caused solely by the bubbling or boiling of the treating liquid is not sufficient to place the process in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

17+, for processes of continuous digestion or continuous charging or discharging of the fibrous material.

41+, for processes in which the treating fluid is separated from the fibrous material and recirculated to the digestion operation.