US PATENT SUBCLASS 162 / 181.8
.~.~.~ Clay

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}
181.8.~.~.~ Clay

DEFINITION

Classification: 162/181.8

Clay:

(under subclass 181.1) Subject matter wherein the inorganic substance comprises any substance considered to be a clay.

(1) Note. See the Glossary in the main class definition of Class 501, Compositions: Ceramic, for the definition of the term clay.