A61K 31/335 having oxygen as the only ring hetero atom, e.g. fungichromin
Introduced: July 1974
Last revised: January 2006
Full Title
Medicinal preparations containing organic active ingredients > Heterocyclic compounds > having oxygen as the only ring hetero atom, e.g. fungichromin
Classification Context
- Section:
- HUMAN NECESSITIES
- Class:
- MEDICAL OR VETERINARY SCIENCE; HYGIENE
- Subclass:
- PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
Filing statistics
IPC A61K 31/335 belongs to the parent subclass A61K, which recorded 1,792,627 patent applications worldwide between 2013 and 2023. Annual filings declined from 147,606 in 2013 to 132,650 in 2023 (-10%), peaking at 177,518 applications in 2016. The most active applicants in class A61 are PHILIPS ELECTRONICS (18,523 applications), NOVARTIS (14,253 applications) and COVIDIEN (13,953 applications).
Source: EPO PATSTAT, worldwide filings
6 direct subcodes
Child Classifications
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- A61K 31/336 having three-membered rings, e.g. oxirane, fumagillin
- A61K 31/337 having four-membered rings, e.g. taxol
- A61K 31/34 having five-membered rings with one oxygen as the only ring hetero atom, e.g. isosorbide
- A61K 31/35 having six-membered rings with one oxygen as the only ring hetero atom
- A61K 31/357 having two or more oxygen atoms in the same ring, e.g. crown ethers, guanadrel
- A61K 31/365 Lactones
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