US PATENT SUBCLASS 8 / 437
.~.~ Azo dye

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

404  DF  DYEING INVOLVING ANIMAL-DERIVED NATURAL FIBER MATERIAL (OTHER THAN SOLELY WOOL OR SILK), E.G., LEATHER, FUR, HAIR, FEATHERS, ETC., COMPOSITION, PROCESS, OR PRODUCT {2}
436  DF  .~ Leather dyeing {1}
437.~.~ Azo dye

DEFINITION

Classification: 8/437

Azo dye:

(under subclass 436) Subject matter using azo dyes (including metal azo) either directly or by developing on the material.