US PATENT SUBCLASS 162 / 181.3
.~.~.~.~ Sulfate or sulfite

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}
181.2  DF  .~.~.~ Metal salt other than silicate {1}
181.3.~.~.~.~ Sulfate or sulfite

DEFINITION

Classification: 162/181.3

Sulfate or sulfite:

(under subclass 181.2) Subject matter wherein the salt is a salt of H2SO4 or H2SO3.