US PATENT SUBCLASS 162 / 19
.~.~ Plural diverse stage treatment

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}
17  DF  .~ Continuous chemical treatment or continuous charging or discharging {2}
19.~.~ Plural diverse stage treatment

DEFINITION

Classification: 162/19

(under subclass 17) Processes in which the fibrous material is subjected to a plurality of dissimilar chemical treatments.

(1) Note. The treatments may be dissimilar in the composition or concentration of the treating medium, the temperature, pressure, or time, of the treatment, etc.