US PATENT SUBCLASS 8 / 639
.~.~ Azo

Current as of: June, 1999
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8 /   HD   BLEACHING AND DYEING; FLUID TREATMENT AND CHEMICAL MODIFICATION OF TEXTILES AND FIBERS

636  DF  DYE OR POTENTIAL DYE COMPOSITION, ADDITIVE, TREATMENT, PROCESS, PRODUCT, OR ANCILLARY DYE OPERATION {12}
638  DF  .~ Mixed dyes, noncomplexed {4}
639.~.~ Azo {2}
640  DF  .~.~.~> With sulfur dye or vat dye
641  DF  .~.~.~> Sulfonated azo

DEFINITION

Classification: 8/639

Azo:

(under subclass 638) Subject matter in which at least one of the dyes is an azo dye.

SEE OR SEARCH THIS CLASS, SUBCLASS:

662, wherein a vat dye compound chemically combines (couples) with an azo dye component to form a true chemical compound as a single dye, and no other azo coupling component or vat or sulfur dye is present.