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Analysing European and International Patent Citations: A Set of EPO Patent Database Building Blocks


  • Colin Webb


  • Hélène Dernis


  • Dietmar Harhoff

    (University of Munich (LMU))

  • Karin Hoisl

    (University of Munich (LMU))


This paper presents a preliminary set of European and international citation data tables designed to enable researchers to become familiar with the subject and undertake a range of analyses. It addresses analytical and statistical issues such as why citations from international searches and European searches should be combined; the calculation of citation lags; use of International Patent Classification (IPC) codes for grouping patents according to technology; treatment of references to Non-Patent Literature (NPL); and the notion that many publications, from different patenting authorities, covering the same invention can be cited. Differences between US and European citations are also discussed. L'analyse des citations de brevets Européens et internationaux : Une selection de modules de la base de données de brevets de l'OEB Ce document présente une première sélection de données sur les citations européennes et internationales. Ces modules ont été construits afin de permettre aux chercheurs de se familiariser avec les citations et d'engager un certain nombre d’analyses. Plusieurs questions analytiques et statistiques sont abordées, notamment : pourquoi combiner les citations issues des recherches internationales avec celles des recherches européennes ; calculer des délais de citation ; utiliser les codes de la Classification internationale des brevets (CIB) pour regrouper les brevets par technologies ; comment considérer les références à la littérature non-brevet (NPL) ; et comment comptabiliser les citations lorsque plusieurs brevets, publiés par différents offices de brevet, pour la même invention sont cités. Les divergences entre citations américaines et européennes sont également étudiées.

Suggested Citation

  • Colin Webb & Hélène Dernis & Dietmar Harhoff & Karin Hoisl, 2005. "Analysing European and International Patent Citations: A Set of EPO Patent Database Building Blocks," OECD Science, Technology and Industry Working Papers 2005/9, OECD Publishing.
  • Handle: RePEc:oec:stiaaa:2005/9-en

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