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International knowledge diffusion and home-bias effect. Do USPTO and EPO patent citations tell the same story?

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Author Info

  • Emanuele Bacchiocchi

    ()
    (University of Milan, Milano, Italy)

  • Fabio Montobbio

    ()
    (Insubria University, Varese, and KITeS, Universita' Bocconi, Milano, Italy)

Abstract

This paper estimates the international diffusion and obsolescence of technological knowledge by technological field and country using patent citations from the U.S. Patent and Trademark Office (USPTO) and from the European Patent Office (EPO). We control for self-citations and for procedural and legal differences between patent offices in the citation procedures using equivalent patents. We show that (1) both at the EPO and USPTO domestic citations come sooner and there is a strong localization effect of patent citations at national level; (2) the US technological system is becoming less central in the international web of knowledge flows; (3) some differences across patent offices emerge in the ranking by technological fields in the speed of diffusion and decay of technological knowledge. We support the conjecture that not only technological opportunities but also absorptive capacity plays a role. Finally on the methodological side we show that at the USPTO the median citation lag is twice as large relatively to the citations at the EPO, that some bias is induced by the different institutional practices at the EPO and USPTO and that using patent families generates a selection bias towards high quality patents.

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Bibliographic Info

Paper provided by KITeS, Centre for Knowledge, Internationalization and Technology Studies, Universita' Bocconi, Milano, Italy in its series KITeS Working Papers with number 015.

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Length: 40 pages
Date of creation: Feb 2009
Date of revision: Feb 2009
Handle: RePEc:cri:cespri:kites15_wp

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Related research

Keywords: Knowledge flows; Spillovers; Diffusion; Patent citations; Technological Opportunities; Absorptive Capacity;

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References

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  1. Luis A. Rivera-Batiz & Paul M. Romer, 1990. "Economic Integration and Endogenous Growth," NBER Working Papers 3528, National Bureau of Economic Research, Inc.
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Citations

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Cited by:
  1. Cappelli, Riccardo & Montobbio, Fabio, 2013. "European Integration and Knowledge Flows across European Regions," Department of Economics and Statistics Cognetti de Martiis LEI & BRICK - Laboratory of Economics of Innovation "Franco Momigliano", Bureau of Research in Innovation, Complexity and Knowledge, Collegio 201309, University of Turin.
  2. Franco Malerba & Maria Mancusi & Fabio Montobbio, 2013. "Innovation, international R&D spillovers and the sectoral heterogeneity of knowledge flows," Review of World Economics (Weltwirtschaftliches Archiv), Springer, vol. 149(4), pages 697-722, December.
  3. Sterzi, Valerio, 2011. "Academic patent value and knowledge transfer in the UK. Does patent ownership matter?," MPRA Paper 34955, University Library of Munich, Germany.
  4. Della Malva, Antonio & Hussinger, Katrin, 2010. "Corporate science in the patent system: An analysis of the semiconductor technology," ZEW Discussion Papers 10-098, ZEW - Zentrum für Europäische Wirtschaftsforschung / Center for European Economic Research.
  5. Montobbio Fabio & Sterzi Valerio, 2012. "The globalization of technology in emerging markets: a gravity model on the determinants of international patent collaborations," Department of Economics and Statistics Cognetti de Martiis LEI & BRICK - Laboratory of Economics of Innovation "Franco Momigliano", Bureau of Research in Innovation, Complexity and Knowledge, Collegio 201208, University of Turin.
  6. Dekker, Thijs & Vollebergh, Herman R.J. & de Vries, Frans P. & Withagen, Cees A., 2012. "Inciting protocols," Journal of Environmental Economics and Management, Elsevier, vol. 64(1), pages 45-67.
  7. Fabio Montobbio & Valerio Sterzi, 2008. "Inventing Together: Exploring the Nature of International Knowledge Spillovers in Latin America," KITeS Working Papers 225, KITeS, Centre for Knowledge, Internationalization and Technology Studies, Universita' Bocconi, Milano, Italy, revised Nov 2008.
  8. Huang, Can & Jacob, Jojo, 2012. "Determinants of quadic patenting: Market access, imitative threat, competition and strength of intellectual property rights," MERIT Working Papers 053, United Nations University - Maastricht Economic and Social Research Institute on Innovation and Technology (MERIT).

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