US PATENT SUBCLASS 8 / 638
.~ Mixed dyes, noncomplexed

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.~ Mixed dyes, noncomplexed {4}
639  DF  .~.~> Azo {2}
642  DF  .~.~> Sulfur dye or vat dye
643  DF  .~.~> Anthraquinone dye
644  DF  .~.~> Basic dye

DEFINITION

Classification: 8/638

Mixed dyes, noncomplexed:

(under subclass 636) Subject matter wherein more than one dye is used and wherein the dyes may be applied simultaneously or sequentially.

(1) Note. The mixed dyes for this area are not complexed, e.g., when two azo dyes complex with a heavy metal they are not included herein.

SEE OR SEARCH THIS CLASS, SUBCLASS:

408, for combination of aniline colors oxidized on hair.

478, for effect coloring processes which may involve the use of several dyes.

529, for dyeing mixed materials with several dyes.