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CPC Subgroup
A61K 31/47

Quinolines; Isoquinolines

Full Title

Medicinal preparations containing organic active ingredients > Heterocyclic compounds > having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins > having six-membered rings with one nitrogen as the only ring hetero atom > Quinolines; Isoquinolines

Filing statistics

CPC A61K 31/47 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

12 direct subcodes

Child Classifications

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  • A61K 31/4704 2-Quinolinones, e.g. carbostyril
  • A61K 31/4706 4-Aminoquinolines; 8-Aminoquinolines, e.g. chloroquine, primaquine
  • A61K 31/4709 Non-condensed quinolines and containing further heterocyclic rings
  • A61K 31/473 ortho- or peri-condensed with carbocyclic ring systems, e.g. acridines, phenanthridines
  • A61K 31/4747 spiro-condensed
  • A61K 31/4748 forming part of bridged ring systems (strychnine A61K31/475; morphinan derivatives A61K31/485)
  • A61K 31/475 having an indole ring, e.g. yohimbine, reserpine, strychnine, vinblastine (vincamine A61K31/4375)
  • A61K 31/48 Ergoline derivatives, e.g. lysergic acid, ergotamine
  • A61K 31/485 Morphinan derivatives, e.g. morphine, codeine
  • A61K 31/49 Cinchonan derivatives, e.g. quinine

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