US PATENT SUBCLASS 423 / 449.4
.~.~.~.~ Halogen or compound thereof

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}
449.4.~.~.~.~ Halogen or compound thereof

DEFINITION

Classification: 423/449.4

Halogen or compound thereof:

(under subclass 449.2) Processes wherein the acid or the gas includes a halogen group element (e.g., HCl).