US PATENT SUBCLASS 162 / 91
.~ Particular raw cellulosic materials

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}
91.~ Particular raw cellulosic materials {8}
92  DF  .~.~> Fossilized, (e.g., peat)
93  DF  .~.~> Bark
94  DF  .~.~> Bamboo
95  DF  .~.~> Cotton fibers or linters
96  DF  .~.~> Sugar cane, bagasse or cornstalks
97  DF  .~.~> Cereal grasses or straws
98  DF  .~.~> Bast (e.g., flax, hemp, jute, ramie, sisal)
99  DF  .~.~> Non-wood

DEFINITION

Classification: 162/91

(under subclass 1) Processes directed to the digestion or chemical treatment of a particular species or type of cellulosic fibrous material.

(1) Note. In this and indented subclasses are placed processes of treating and digesting fibrous material of particular specified kinds of sources. In view of the fact that most fiber digesting processes are provided for in preceding subclasses, these subclasses contain many cross references of patents provided for above. Cross references

of patents classified in subclasses 100 and 232, disclosing the use of fibers from particular sources, may also be found herein.

(2) Note. This subclass provides for the digestion of particular species of wood fibers.