US PATENT SUBCLASS 162 / 23
.~ Mechanical defibration in the presence of heated gas or gas under pressure

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}
23.~ Mechanical defibration in the presence of heated gas or gas under pressure

DEFINITION

Classification: 162/23

(under subclass 1) Processes in which the fibrous material is subjected simultaneously to a mechanical disintegrating or attrition step and a digestion in the presence of a gas at an elevated temperature or pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

26, for processes in which the fibrous material is subjected to a simultaneous chemical treatment and mechanical defibration not in the presence of a gas.

63, for processes of fiber treatment in the presence of a gas, vapor or mist.

SEE OR SEARCH CLASS

241, Solid Material Comminution or Disintegration, 18+, for other disintegration or comminution processes carried out in the presence of a gas or vapor.