US PATENT SUBCLASS 162 / 85
.~.~.~.~.~ Chlorine containing material in at least one stage

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}
70  DF  .~ Treatment with particular chemical {9}
82  DF  .~.~ Sulfur containing {1}
83  DF  .~.~.~ Sulfur dioxide or sulfite {1}
84  DF  .~.~.~.~ Plural diverse stage treatment {2}
85.~.~.~.~.~ Chlorine containing material in at least one stage

DEFINITION

Classification: 162/85

(under subclass 84) Processes in which a chlorine containing material is employed in at least one stage.

(1) Note. The chlorine containing material may be used in combination with the sulfite or sulfur dioxide in the same stage or in a stage separate therefrom in a multistage process.