DIFF Subgroup
C12P 17/10 Nitrogen as only ring hetero atom
Introduced: January 1980
Full Title
Full titles differ between systems:
IPC:
Preparation of heterocyclic carbon compounds with only O, N, S, Se, or Te as ring hetero atoms > Nitrogen as only ring hetero atom
CPC:
Preparation of heterocyclic carbon compounds with only O, N, S, Se or Te as ring hetero atoms (C12P13/04 - C12P13/24 take precedence) > Nitrogen as only ring hetero atom
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
IPC defines codes here since 1980.
Child Classifications
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