US PATENT SUBCLASS 8 / 655
.~.~ Heterocyclic onium group, e.g., pyridinium, etc.

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}
654  DF  .~ Basic (cationic) dye containing strongly basic onium or alkylene imine group {1}
655.~.~ Heterocyclic onium group, e.g., pyridinium, etc.

DEFINITION

Classification: 8/655

Heterocyclic onium group, e.g., pyridinium, etc.:

(under subclass 654) Subject matter containing heterocyclic onium group, e.g., pyridinium dyes, etc.