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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5/00
Dyes with an anthracene nucleus condensed with one or more heterocyclic rings with or without carbocyclic rings
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C09B5/02
the heterocyclic ring being; only; condensed in peri position
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C09B5/022
not provided for in one of the sub groups C09B5/04 - C09B5/20
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