US PATENT SUBCLASS 8 / 688
.~.~ Six-membered hetero ring having two or more ring hetero atoms of which at least one is nitrogen

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}
662  DF  .~ Azo, acridone, or quinone dye {15}
688.~.~ Six-membered hetero ring having two or more ring hetero atoms of which at least one is nitrogen {1}
689  DF  .~.~.~> Diazines (including hydrogenated)

DEFINITION

Classification: 8/688

Six-membered hetero ring having two or more ring hetero atoms of which at least one is nitrogen:

(under subclass 662) Subject matter wherein a dye contains a hetero ring having two or more ring hetero atoms at least one of which is nitrogen.