US PATENT SUBCLASS 8 / 574
.~ Five-membered hetero ring consisting of one nitrogen and four carbon atoms

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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}
574.~ Five-membered hetero ring consisting of one nitrogen and four carbon atoms

DEFINITION

Classification: 8/574

Five-membered hetero ring consisting of one nitrogen and four carbon atoms:

(under subclass 550) Subject matter wherein the organic additive is a compound with a five-membered ring containing one nitrogen and four carbons in the ring, including hydrogenated compounds.

(1) Note. This subclass includes poly- carboxylic acid imides, e.g., phthalimide.