Patent classifications
C
CHEMISTRY; METALLURGY
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C09
DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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C09B
ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES; , e.g. PIGMENTS; MORDANTS; LAKES
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33/00
Disazo and polyazo dyes of the types A->K<-B, A->B->K<-C, or the like, prepared by diazotising and coupling
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C09B33/12
in which the coupling component is a heterocyclic compound
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