US PATENT SUBCLASS 162 / 181.9
.~.~.~ Free metal or free carbon containing

Current as of: June, 1999
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162 /   HD   PAPER MAKING AND FIBER LIBERATION

100  DF  PROCESSES AND PRODUCTS {31}
158  DF  .~ Non-fiber additive {16}
181.1  DF  .~.~ Inorganic {5}
181.9.~.~.~ Free metal or free carbon containing

DEFINITION

Classification: 162/181.9

Free metal or free carbon containing:

(under subclass 181.1) Subject matter comprising a metal or carbon in elemental form.