US PATENT SUBCLASS 8 / 573
.~.~ Hetero N ring contains at least two nitrogen hetero atoms (including hydrogenated)

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

550  DF  ORGANIC ADDITIVE FOR DYE COMPOSITION, DYE COMPOSITION CONTAINING ORGANIC ADDITIVE, PROCESS OR PRODUCT; OTHER THAN EMULSIFIER, PH ADJUSTER OR STARCH OR GUM PRINT PASTE THICKENER {24}
570  DF  .~ Five-membered hetero ring having two or more ring hetero atoms of which at least one is nitrogen {3}
573.~.~ Hetero N ring contains at least two nitrogen hetero atoms (including hydrogenated)

DEFINITION

Classification: 8/573

Hetero N ring contains at least two nitrogen hetero atoms (including hydrogenated):

(under subclass 570) Subject matter wherein the organic additive is a hetero compound having a five-membered ring with at least two nitrogen atoms in the ring, e.g., a diazole, etc., including hydrogenated compounds.