DIFF Subgroup
A61K 31/21 Esters, e.g. nitroglycerine, selenocyanates
Introduced: July 1974
Full Title
Medicinal preparations containing organic active ingredients > Esters, e.g. nitroglycerine, selenocyanates
IPC and CPC are identically structured here. All 5 subcodes exist in both systems.
2 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1974.
Child Classifications
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- A61K 31/255 of sulfoxy acids or sulfur analogues thereof since 1974 IPC+CPC Available in IPC and CPC
- A61K 31/26 Cyanate or isocyanate esters; Thiocyanate or isothiocyanate esters since 1974 IPC+CPC Available in IPC and CPC
- A61K 31/265 of carbonic, thiocarbonic, or thiocarboxylic acids, e.g. thioacetic acid, xanthogenic acid, trithiocarbonic acid since 1974 IPC+CPC Available in IPC and CPC
- A61K 31/27 of carbamic or thiocarbamic acids, meprobamate, carbachol, neostigmine since 1974 IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
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
Top Applicants (CPC)
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