Heterocyclic compounds having nitrogen in the ring

Introduced: July 1974

Full Title

Use of organic ingredients > Nitrogen-containing compounds > Heterocyclic compounds having nitrogen in the ring

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

IPC defines codes here since 1974.

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C08K 5/3412 having one nitrogen atom in the ring since 1990 IPC+CPC Available in IPC and CPC
C08K 5/3442 having two nitrogen atoms in the ring since 1990 IPC+CPC Available in IPC and CPC
C08K 5/3467 having more than two nitrogen atoms in the ring since 1990 IPC+CPC Available in IPC and CPC
C08K 5/35 having also oxygen in the ring since 1974 IPC+CPC Available in IPC and CPC