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PCE
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DIFF Subgroup
A61K 31/4427

containing further heterocyclic ring systems

Introduced: January 2000

Full Title

Full titles differ between systems:

IPC:

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 > Non-condensed pyridines; Hydrogenated derivatives thereof > containing further heterocyclic ring systems

CPC:

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 > Non condensed pyridines; Hydrogenated derivatives thereof > containing further heterocyclic ring systems

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 2000.

Child Classifications

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  • A61K 31/443 containing a five-membered ring with oxygen as a ring hetero atom since 2000 IPC+CPC Available in IPC and CPC
  • A61K 31/4433 containing a six-membered ring with oxygen as a ring hetero atom since 2000 IPC+CPC Available in IPC and CPC
  • A61K 31/4436 containing a heterocyclic ring having sulfur as a ring hetero atom since 2000 IPC+CPC Available in IPC and CPC
  • A61K 31/4439 containing a five-membered ring with nitrogen as a ring hetero atom, e.g. omeprazole (nicotine A61K31/465) since 2000 IPC+CPC Available in IPC and CPC
  • A61K 31/444 containing a six-membered ring with nitrogen as a ring heteroatom, e.g. amrinone since 2000 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class A61,2013–2023, worldwide · Source: EPO PATSTAT

  1. PHILIPS ELECTRONICS NL 18,523
  2. NOVARTIS CH 14,253
  3. COVIDIEN US 13,953
  4. ROCHE CH 12,005
  5. CHINESE ACADEMY OF SCIENCES 11,955
  6. UNIVERSITY OF CALIFORNIA US 11,692
  7. HARVARD UNIVERSITY US 11,596
  8. L'OREAL FR 11,593
  9. P&G (PROCTER & GAMBLE COMPANY) US 11,297
  10. OLYMPUS CORPORATION JP 9,594

Top Applicants (CPC)

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