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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. Rivera-Batiz, Luis A & Romer, Paul M, 1991. "Economic Integration and Endogenous Growth," The Quarterly Journal of Economics, MIT Press, vol. 106(2), pages 531-55, May.
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Citations

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Cited by:
  1. Fabio Montobbio & Valerio Sterzi, 2011. "Inventing together: exploring the nature of international knowledge spillovers in Latin America," Journal of Evolutionary Economics, Springer, vol. 21(1), pages 53-89, February.
  2. Sterzi, Valerio, 2011. "Academic patent value and knowledge transfer in the UK. Does patent ownership matter?," MPRA Paper 34955, University Library of Munich, Germany.
  3. 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).
  4. Montobbio, Fabio & Sterzi, Valerio, 2013. "The Globalization of Technology in Emerging Markets: A Gravity Model on the Determinants of International Patent Collaborations," World Development, Elsevier, vol. 44(C), pages 281-299.
  5. Franco Malerba & Maria Luisa Mancusi & Fabio Montobbio, 2007. "Innovation, international R&D Spillovers and the sectoral heterogeneity of knowledge flows," KITeS Working Papers 204, KITeS, Centre for Knowledge, Internationalization and Technology Studies, Universita' Bocconi, Milano, Italy, revised Oct 2007.
  6. Cappelli, Riccardo & Montobbio, Fabio, 2013. "European Integration and Knowledge Flows across European Regions," Department of Economics and Statistics Cognetti de Martiis. Working Papers 201322, University of Turin.
  7. 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.
  8. Malva, Antonio Della & Hussinger, Katrin, 2012. "Corporate science in the patent system: An analysis of the semiconductor technology," Journal of Economic Behavior & Organization, Elsevier, vol. 84(1), pages 118-135.

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