DIFF Subgroup
C09B 43/40 by substituting hetero atoms by radicals containing other hetero atoms
Introduced: January 1980
Full Title
Preparation of azo dyes from other azo compounds > by substituting hetero atoms by radicals containing other hetero atoms
Of 2 combined children, 1 exist in both systems.
1 codes are CPC-only extensions.
IPC defines codes here since 1980.
Child Classifications
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- C09B 43/42 by substituting radicals containing hetero atoms for —CN radicals since 1980 IPC+CPC Available in IPC and CPC