US PATENT SUBCLASS 162 / 92
.~.~ Fossilized, (e.g., peat)

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  DF  .~ Particular raw cellulosic materials {8}
92.~.~ Fossilized, (e.g., peat)

DEFINITION

Classification: 162/92

(under subclass 91) Processes directed to the digestion or chemical treatment of petrified vegetable material, such as peat or lignite.