DIFF Subgroup
A61K 31/395 having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
Introduced: July 1974
Full Title
Medicinal preparations containing organic active ingredients > Heterocyclic compounds > having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
Of 11 combined children, 10 exist in both systems.
1 codes are CPC-only extensions.
5 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1974.
Child Classifications
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- A61K 31/40 having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil since 1974 IPC+CPC Available in IPC and CPC
- A61K 31/41 having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole since 1974 IPC+CPC Available in IPC and CPC
- A61K 31/435 having six-membered rings with one nitrogen as the only ring hetero atom since 1974 IPC+CPC Available in IPC and CPC
- A61K 31/495 having six-membered rings with two nitrogen atoms as the only ring heteroatoms, e.g. piperazine (A61K31/48 takes precedence ) since 1974 IPC+CPC Available in IPC and CPC
- A61K 31/53 having six-membered rings with three nitrogens as the only ring hetero atoms, e.g. chlorazanil, melamine (melarsoprol A61K31/555 ) since 1974 IPC+CPC Available in IPC and CPC
- A61K 31/535 having six-membered rings with at least one nitrogen and one oxygen as the ring hetero atoms, e.g. 1,2-oxazines since 1974 IPC+CPC Available in IPC and CPC
- A61K 31/54 having six-membered rings with at least one nitrogen and one sulfur as the ring hetero atoms, e.g. sulthiame since 1974 IPC+CPC Available in IPC and CPC
- A61K 31/55 having seven-membered rings, e.g. azelastine, pentylenetetrazole since 1974 IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class A61,2013–2023, worldwide · Source: EPO PATSTAT
- PHILIPS ELECTRONICS NL 18,523
- NOVARTIS CH 14,253
- COVIDIEN US 13,953
- ROCHE CH 12,005
- CHINESE ACADEMY OF SCIENCES 11,955
- UNIVERSITY OF CALIFORNIA US 11,692
- HARVARD UNIVERSITY US 11,596
- L'OREAL FR 11,593
- P&G (PROCTER & GAMBLE COMPANY) US 11,297
- OLYMPUS CORPORATION JP 9,594
Top Applicants (CPC)
Class A61,2013–2023, worldwide · Source: EPO PATSTAT
- PHILIPS ELECTRONICS NL 20,621
- NOVARTIS CH 15,792
- ROCHE CH 14,303
- COVIDIEN US 13,862
- HARVARD UNIVERSITY US 13,454
- UNIVERSITY OF CALIFORNIA US 12,798
- P&G (PROCTER & GAMBLE COMPANY) US 12,140
- L'OREAL FR 11,800
- OLYMPUS CORPORATION JP 9,894
- BOSTON SCIENTIFIC SCIMED US 9,513