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EPO vs. USPTO Citation Lags

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Author Info
Fabio Montobbio (University of Insubria and CESPRI, Università Bocconi, Milano)
E. Bacchiocchi (University of Milan,)

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Abstract

This paper estimates the diffusion and obsolescence of technological knowledge by technological field, country and type of institutions that generates it. We use two comparable samples of patents and patent citations from the NBER U.S. Patent Citations Dataset (based on patents from the US Patent Office) and from the EP Cespri Dataset (based on patents from the European Patent Office). Using a quasi-structural model, as proposed by Caballero and Jaffe (1993) and discussed in Hall et al. (2001), We test whether the observed processes of knowledge diffusion and obsolescence reflect the specific institutional mechanism generating them. Results show that at the USPTO there are more citations per patent due to the different rules governing citation practices and that their median lag is twice as large relatively to the citations at the EPO. We also find that the relative properties of the citation frequencies indifferent technological fields change according to the patent office considered.

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Publisher Info
Paper provided by CESPRI, Centre for Research on Innovation and Internationalisation, Universita' Bocconi, Milano, Italy in its series CESPRI Working Papers with number 161.

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Length: 20 pages
Date of creation: Sep 2004
Date of revision: Sep 2004
Handle: RePEc:cri:cespri:wp161

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Related research
Keywords: Patent citations; Knowledge flows; Spillovers; Diffusion; Patent Examiners.;

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Find related papers by JEL classification:
O30 - Economic Development, Technological Change, and Growth - - Technological Change - - - General
O33 - Economic Development, Technological Change, and Growth - - Technological Change - - - Technological Change: Choices and Consequences; Diffusion Processes
O34 - Economic Development, Technological Change, and Growth - - Technological Change - - - Intellectual Property Rights

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References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
  1. Bronwyn H. Hall, Adam Jaffe and Manuel Trajtenberg., 2000. "Market Value and Patent Citations: A First Look," Economics Working Papers E00-277, University of California at Berkeley. [Downloadable!]
    Other versions:
  2. Stefano Breschi & Francesco Lissoni, 2004. "Knowledge networks from patent data: Methodological issues and research targets," CESPRI Working Papers 150, CESPRI, Centre for Research on Innovation and Internationalisation, Universita' Bocconi, Milano, Italy, revised Jan 2004. [Downloadable!]
  3. Adam B. Jaffe & Manuel Trajtenberg, 1998. "International Knowledge Flows: Evidence from Patent Citations," NBER Working Papers 6507, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
    Other versions:
  4. Bronwyn H. Hall & Adam Jaffe & Manuel Trajtenberg, 2005. "Market Value and Patent Citations," RAND Journal of Economics, The RAND Corporation, vol. 36(1), pages 16-38, Spring.
  5. Bronwyn H. Hall & Adam B. Jaffe & Manuel Trajtenberg, 2001. "The NBER Patent Citation Data File: Lessons, Insights and Methodological Tools," NBER Working Papers 8498, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
    Other versions:
  6. Malerba Franco & Mancusi Maria Luisa & Montobbio Fabio, 2003. "Innovation and Knowledge Spillovers: Evidence from European Data," Economics and Quantitative Methods qf0319, Department of Economics, University of Insubria. [Downloadable!]
  7. Adam B. Jaffe & Manuel Trajtenberg, 2005. "Patents, Citations, and Innovations: A Window on the Knowledge Economy," MIT Press Books, The MIT Press, edition 1, volume 1, number 026260065x.
  8. Dietmar Harhoff & Francis Narin & F. M. Scherer & Katrin Vopel, 1999. "Citation Frequency And The Value Of Patented Inventions," The Review of Economics and Statistics, MIT Press, vol. 81(3), pages 511-515, August. [Downloadable!] (restricted)
  9. Jean O. Lanjouw & Mark Schankerman, 2004. "Patent Quality and Research Productivity: Measuring Innovation with Multiple Indicators," Economic Journal, Royal Economic Society, vol. 114(495), pages 441-465, 04. [Downloadable!] (restricted)
  10. Fung, Michael K., 2003. "Technological proximity and co-movements of stock returns," Economics Letters, Elsevier, vol. 79(1), pages 131-136, April. [Downloadable!] (restricted)
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Cited by:
(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Emanuele Bacchiocchi & Fabio Montobbio, 2006. "Knowledge diffusion from university and public research. A comparison between US, Japan and Europe using patent citations," CESPRI Working Papers 193, CESPRI, Centre for Research on Innovation and Internationalisation, Universita' Bocconi, Milano, Italy, revised Dec 2006. [Downloadable!]
    Other versions:
  2. Schneider, Cédric & Hussinger, Katrin & Czarnitzki, Dirk, 2008. "Commercializing Academic Research: The Quality of Faculty Patenting," ZEW Discussion Papers 08-069, ZEW - Zentrum für Europäische Wirtschaftsforschung / Center for European Economic Research. [Downloadable!]
    Other versions:
  3. Aditi Mehta & Marc Rysman & Tim Simcoe, 2007. "Identifying the Age Profile of Patent Citations," Boston University - Department of Economics - Working Papers Series WP2007-021, Boston University - Department of Economics. [Downloadable!]
    Other versions:
  4. Bronwyn H. Hall & Grid Thoma & Salvatore Torrisi, 2006. "The market value of patents and R&D: Evidence from European firms," CESPRI Working Papers 186, CESPRI, Centre for Research on Innovation and Internationalisation, Universita' Bocconi, Milano, Italy, revised Nov 2006. [Downloadable!]
    Other versions:
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