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CPC Subgroup
A61K 31/21

Esters, e.g. nitroglycerine, selenocyanates

Full Title

Medicinal preparations containing organic active ingredients > Esters, e.g. nitroglycerine, selenocyanates

5 direct subcodes

Child Classifications

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  • A61K 31/255 of sulfoxy acids or sulfur analogues thereof
  • A61K 31/26 Cyanate or isocyanate esters; Thiocyanate or isothiocyanate esters
  • A61K 31/265 of carbonic, thiocarbonic, or thiocarboxylic acids, e.g. thioacetic acid, xanthogenic acid, trithiocarbonic acid
  • A61K 31/27 of carbamic or thiocarbamic acids, meprobamate, carbachol, neostigmine

Top Applicants

Top 10 applicants by patent filingsfor class A61, 2013–2023, worldwide · Source: EPO PATSTAT

  1. PHILIPS ELECTRONICS NL 20,621
  2. NOVARTIS CH 15,792
  3. ROCHE CH 14,303
  4. COVIDIEN US 13,862
  5. HARVARD UNIVERSITY US 13,454
  6. UNIVERSITY OF CALIFORNIA US 12,798
  7. P&G (PROCTER & GAMBLE COMPANY) US 12,140
  8. L'OREAL FR 11,800
  9. OLYMPUS CORPORATION JP 9,894
  10. BOSTON SCIENTIFIC SCIMED US 9,513