CPC Subgroup
A61K 31/33 Heterocyclic compounds
Full Title
Medicinal preparations containing organic active ingredients > Heterocyclic compounds
4 direct subcodes
Child Classifications
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- A61K 31/335 having oxygen as the only ring hetero atom, e.g. fungichromin
- A61K 31/38 having sulfur as a ring hetero atom
- A61K 31/395 having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K 31/555 containing heavy metals, e.g. hemin, hematin, melarsoprol
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