US PATENT SUBCLASS 162 / 181.4
.~.~.~ Metal oxide or hydroxide

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}
181.4.~.~.~ Metal oxide or hydroxide {1}
181.5  DF  .~.~.~.~> Metal other than alkali metal, magnesium, or alkaline earth metal

DEFINITION

Classification: 162/181.4

Metal oxide or hydroxide:

(under subclass 181.1) Subject matter comprising a binary compound of oxygen and a metallic element or a metallic element connected to an -OH group.