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IPC Subgroup
A61K 31/4

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

Introduced: July 1974

Last revised: January 2006

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

Classification Context

Section:
HUMAN NECESSITIES
Class:
MEDICAL OR VETERINARY SCIENCE; HYGIENE
Subclass:
PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES

7 direct subcodes

Child Classifications

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  • A61K 31/401 Proline; Derivatives thereof, e.g. captopril
  • A61K 31/4015 having oxo groups directly attached to the heterocyclic ring, e.g. piracetam, ethosuximide
  • A61K 31/402 1-aryl-substituted, e.g. piretanide
  • A61K 31/4025 not condensed and containing further heterocyclic rings, e.g. cromakalim
  • A61K 31/407 condensed with heterocyclic ring systems, e.g. ketorolac, physostigmine
  • A61K 31/409 having four such rings, e.g. porphine derivatives, bilirubin, biliverdine

Top Applicants

Top 10 applicants by patent filingsfor 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