US PATENT SUBCLASS 423 / 449.3
.~.~.~.~ Treating with acid, or gas which forms acid in water

Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

414  DF  CARBON OR COMPOUND THEREOF {3}
445 R  DF  .~ Elemental carbon {7}
449.1  DF  .~.~ Carbon black (e.g., lampblack) {6}
449.2  DF  .~.~.~ Treating carbon black {3}
449.3.~.~.~.~ Treating with acid, or gas which forms acid in water

DEFINITION

Classification: 423/449.3

Treating with acid, or gas which forms an acid in water:

(under subclass 449.2) Processes wherein the carbon black material is treated with a compound that is an acid or with a gas that in an aqueous state would form an acid (e.g., H2S).