Skip to content
PCE
Search Classifications
Search for IPC and CPC classification codes or keywords
DIFF Subgroup
A61K 31/495

having six-membered rings with two nitrogen atoms as the only ring heteroatoms, e.g. piperazine (A61K31/48 takes precedence )

Introduced: July 1974

Title

Titles differ between systems:

IPC: having six-membered rings with two nitrogen atoms as the only ring hetero atoms, e.g. piperazine

CPC: having six-membered rings with two nitrogen atoms as the only ring heteroatoms, e.g. piperazine (A61K31/48 takes precedence )

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 two nitrogen atoms as the only ring hetero atoms, e.g. piperazine

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 two nitrogen atoms as the only ring heteroatoms, e.g. piperazine (A61K31/48 takes precedence )

IPC and CPC are identically structured here. All 8 subcodes exist in both systems.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1974.

Child Classifications

Navigate with arrow keys, Enter to open

  • A61K 31/496 Non-condensed piperazines containing further heterocyclic rings, e.g. rifampin, thiothixene or sparfloxacin since 2000 IPC+CPC Available in IPC and CPC
  • A61K 31/498 Pyrazines or piperazines ortho- and peri-condensed with carbocyclic ring systems, e.g. quinoxaline, phenazine since 2000 IPC+CPC Available in IPC and CPC
  • A61K 31/4985 Pyrazines or piperazines ortho- or peri-condensed with heterocyclic ring systems since 2000 IPC+CPC Available in IPC and CPC
  • A61K 31/499 Spiro-condensed pyrazines or piperazines since 2000 IPC+CPC Available in IPC and CPC
  • A61K 31/4995 Pyrazines or piperazines forming part of bridged ring systems 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