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 31/403 condensed with carbocyclic rings, e.g. carbazole
- 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
- 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