A61K 31/34 having five-membered rings with one oxygen as the only ring hetero atom, e.g. isosorbide
Full Title
Medicinal preparations containing organic active ingredients > Heterocyclic compounds > having oxygen as the only ring hetero atom, e.g. fungichromin > having five-membered rings with one oxygen as the only ring hetero atom, e.g. isosorbide
Filing statistics
CPC A61K 31/34 belongs to the parent subclass A61K, which recorded 1,717,491 patent applications worldwide between 2013 and 2023. Annual filings grew from 114,681 in 2013 to 125,843 in 2023 (+10%), peaking at 182,901 applications in 2016. The most active applicants in class A61 are PHILIPS ELECTRONICS (20,621 applications), NOVARTIS (15,792 applications) and ROCHE (14,303 applications).
Source: EPO PATSTAT, worldwide filings
3 direct subcodes
Child Classifications
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- A61K 31/341 not condensed with another ring, e.g. ranitidine, furosemide, bufetolol, muscarine
- A61K 31/343 condensed with a carbocyclic ring, e.g. coumaran, bufuralol, befunolol, clobenfurol, amiodarone
- A61K 31/345 Nitrofurans (nitrofurantoin A61K31/4178)
Top Applicants
Top 10 applicants by patent filingsfor 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