US PATENT SUBCLASS 162 / 54
.~ Freezing

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}
54.~ Freezing

DEFINITION

Classification: 162/54

(under subclass 1) Processes which include a step of lowering the temperature so as to freeze at least a portion of the liquid employed in the fiber liberation or treatment.

SEE OR SEARCH THIS CLASS, SUBCLASS:

47, for digestion processes combined with the step of

recovering heat therefrom.

239, for a digester combined with means to recover heat therefrom.

, SEARCH CLASS:

62, Refrigeration, appropriate subclasses, for refrigeration processes and apparatus.