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PCE
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DIFF Subgroup
A61K 31/40

having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil

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 > having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil

IPC and CPC are identically structured here. All 7 subcodes exist in both systems.

3 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 2000.

Child Classifications

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  • A61K 31/401 Proline; Derivatives thereof, e.g. captopril since 2000 IPC+CPC Available in IPC and CPC
  • A61K 31/4015 having oxo groups directly attached to the heterocyclic ring, e.g. piracetam, ethosuximide since 2000 IPC+CPC Available in IPC and CPC
  • A61K 31/402 1-aryl substituted, e.g. piretanide since 2000 IPC+CPC Available in IPC and CPC
  • A61K 31/4025 not condensed and containing further heterocyclic rings, e.g. cromakalim since 2000 IPC+CPC Available in IPC and CPC
  • A61K 31/407 condensed with other heterocyclic ring systems, e.g. ketorolac, physostigmine since 2000 IPC+CPC Available in IPC and CPC
  • A61K 31/409 having four such rings, e.g. porphine derivatives, bilirubin, biliverdine (hemin, hematin A61K31/555) since 2000 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class A61,2013–2023, worldwide · Source: EPO PATSTAT

  1. PHILIPS ELECTRONICS NL 18,523
  2. NOVARTIS CH 14,253
  3. COVIDIEN US 13,953
  4. ROCHE CH 12,005
  5. CHINESE ACADEMY OF SCIENCES 11,955
  6. UNIVERSITY OF CALIFORNIA US 11,692
  7. HARVARD UNIVERSITY US 11,596
  8. L'OREAL FR 11,593
  9. P&G (PROCTER & GAMBLE COMPANY) US 11,297
  10. OLYMPUS CORPORATION JP 9,594

Top Applicants (CPC)

Class A61,2013–2023, worldwide · Source: EPO PATSTAT

  1. PHILIPS ELECTRONICS NL 20,621
  2. NOVARTIS CH 15,792
  3. ROCHE CH 14,303
  4. COVIDIEN US 13,862
  5. HARVARD UNIVERSITY US 13,454
  6. UNIVERSITY OF CALIFORNIA US 12,798
  7. P&G (PROCTER & GAMBLE COMPANY) US 12,140
  8. L'OREAL FR 11,800
  9. OLYMPUS CORPORATION JP 9,894
  10. BOSTON SCIENTIFIC SCIMED US 9,513