US PATENT SUBCLASS 162 / 24
.~ Chemical treatment after start or completion of mechanical defibration

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}
24.~ Chemical treatment after start or completion of mechanical defibration {1}
25  DF  .~.~> With additional chemical treatment before start of defibration

DEFINITION

Classification: 162/24

(under subclass 1) Processes combined with mechanical defibration step in which chemical treatment is initiated after the start or the completion of a mechanical defibration of the fibrous material.

SEE OR SEARCH CLASS

241, Solid Material Comminution or Disintegration, particularly

15+, for processes of mechanically comminuting defibering fibrous materials with application of a fluid to the material not involving any chemical treatment of the fibrous material.