DIFF Subgroup
C12P 17/14 Nitrogen or oxygen as hetero atom and at least one other diverse hetero ring atom in the same ring
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 or oxygen as hetero atom and at least one other diverse hetero ring atom in the same ring
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 or oxygen as hetero atom and at least one other diverse hetero ring atom in the same ring
No child classifications to compare. This is a leaf node in both IPC and CPC.