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International patent families: from application strategies to statistical indicators

Author

Listed:
  • Antoine Dechezleprêtre

    (London School of Economics)

  • Yann Ménière

    (MINES ParisTech, PSL – Research University, CERNA, i3 UMR CNRS)

  • Myra Mohnen

    (University of Essex)

Abstract

This paper provides an in-depth analysis of the characteristics of international patent families, including their domestic component. We exploit a relatively under-studied feature of patent families, namely the number of patents covering the same invention within a given jurisdiction. Using this information, we highlight common patterns in the structure of international patent families, which reflect both the patenting strategies of innovators and the peculiarities of the different patent systems. While the literature has extensively used family size, i.e. the number of countries in which a given invention is protected, as a measure of patent value, our results suggest that the number of patent filings in the priority country within a patent family as well as the timespan between the first and last filings within a family are other insightful indicators of the value of patented innovations.

Suggested Citation

  • Antoine Dechezleprêtre & Yann Ménière & Myra Mohnen, 2017. "International patent families: from application strategies to statistical indicators," Scientometrics, Springer;Akadémiai Kiadó, vol. 111(2), pages 793-828, May.
  • Handle: RePEc:spr:scient:v:111:y:2017:i:2:d:10.1007_s11192-017-2311-4
    DOI: 10.1007/s11192-017-2311-4
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    as
    1. Hegde, Deepak & Sampat, Bhaven, 2009. "Examiner citations, applicant citations, and the private value of patents," Economics Letters, Elsevier, vol. 105(3), pages 287-289, December.
    2. Lanjouw, Jean O & Schankerman, Mark, 2001. "Characteristics of Patent Litigation: A Window on Competition," RAND Journal of Economics, The RAND Corporation, vol. 32(1), pages 129-151, Spring.
    3. Rebecca Henderson & Iain Cockburn, 1996. "Scale, Scope, and Spillovers: The Determinants of Research Productivity in Drug Discovery," RAND Journal of Economics, The RAND Corporation, vol. 27(1), pages 32-59, Spring.
    4. Bruno Pottelsberghe de la Potterie & Nicolas Zeebroeck, 2008. "A brief history of space and time: The scope-year index as a patent value indicator based on families and renewals," Scientometrics, Springer;Akadémiai Kiadó, vol. 75(2), pages 319-338, May.
    5. van Zeebroeck, Nicolas & van Pottelsberghe de la Potterie, Bruno & Guellec, Dominique, 2009. "Claiming more: the Increased Voluminosity of Patent Applications and its Determinants," Research Policy, Elsevier, vol. 38(6), pages 1006-1020, July.
    6. Nicolas van Zeebroeck & Bruno van Pottelsberghe de la Potterie, 2011. "The vulnerability of patent value determinants," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 20(3), pages 283-308.
    7. Philippe Aghion & Antoine Dechezleprêtre & David Hémous & Ralf Martin & John Van Reenen, 2016. "Carbon Taxes, Path Dependency, and Directed Technical Change: Evidence from the Auto Industry," Journal of Political Economy, University of Chicago Press, vol. 124(1), pages 1-51.
    8. Manuel Trajtenberg, 1990. "A Penny for Your Quotes: Patent Citations and the Value of Innovations," RAND Journal of Economics, The RAND Corporation, vol. 21(1), pages 172-187, Spring.
    9. Christine Greenhalgh & Mark Rogers, 2007. "The value of intellectual property rights to firms and society," Oxford Review of Economic Policy, Oxford University Press, vol. 23(4), pages 541-567, Winter.
    10. Dominique Guellec & Bruno Van Pottelsberghe, 2004. "Measuring the globalisation of technology: An approach based on patent data," Working Papers CEB 04-013.RS, ULB -- Universite Libre de Bruxelles.
    11. Zvi Griliches, 1984. "R&D, Patents, and Productivity," NBER Books, National Bureau of Economic Research, Inc, number gril84-1, June.
    12. Schankerman, Mark & Pakes, Ariel, 1986. "Estimates of the Value of Patent Rights in European Countries during the Post-1950 Period," Economic Journal, Royal Economic Society, vol. 96(384), pages 1052-1076, December.
    13. Nicolas van Zeebroeck & Bruno van Pottelsberghe de la Potterie, 2011. "Filing strategies and patent value," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 20(6), pages 539-561, February.
    14. Dechezlepretre, Antoine & Glachant, Matthieu & Hascic, Ivan & Johnstone, Nick & Meniere, Yann, 2009. "Invention and Transfer of Climate Change Mitigation Technologies on a Global Scale: A Study Drawing on Patent Data," Sustainable Development Papers 54361, Fondazione Eni Enrico Mattei (FEEM).
    15. 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.
    16. G. M.P. Swann, 2009. "The Economics of Innovation," Books, Edward Elgar Publishing, number 13211.
    17. Bronwyn H. Hall, 2005. "Exploring the Patent Explosion," Springer Books, in: Albert N. Link & F. M. Scherer (ed.), Essays in Honor of Edwin Mansfield, pages 195-208, Springer.
    18. repec:fth:harver:1473 is not listed on IDEAS
    19. de Rassenfosse, Gaétan & Dernis, Hélène & Guellec, Dominique & Picci, Lucio & van Pottelsberghe de la Potterie, Bruno, 2013. "The worldwide count of priority patents: A new indicator of inventive activity," Research Policy, Elsevier, vol. 42(3), pages 720-737.
    20. Janusz A. Ordover, 1991. "A Patent System for Both Diffusion and Exclusion," Journal of Economic Perspectives, American Economic Association, vol. 5(1), pages 43-60, Winter.
    21. Zvi Griliches, 1998. "Patent Statistics as Economic Indicators: A Survey," NBER Chapters, in: R&D and Productivity: The Econometric Evidence, pages 287-343, National Bureau of Economic Research, Inc.
    22. Lanjouw, Jean O & Pakes, Ariel & Putnam, Jonathan, 1998. "How to Count Patents and Value Intellectual Property: The Uses of Patent Renewal and Application Data," Journal of Industrial Economics, Wiley Blackwell, vol. 46(4), pages 405-432, December.
    23. Pakes, Ariel S, 1986. "Patents as Options: Some Estimates of the Value of Holding European Patent Stocks," Econometrica, Econometric Society, vol. 54(4), pages 755-784, July.
    24. Wesley M. Cohen & Richard R. Nelson & John P. Walsh, 2000. "Protecting Their Intellectual Assets: Appropriability Conditions and Why U.S. Manufacturing Firms Patent (or Not)," NBER Working Papers 7552, National Bureau of Economic Research, Inc.
    25. Christine Greenhalgh & Mark Rogers, 2007. "The Value of Intellectual Property Rights to Firms," Economics Series Working Papers 319, University of Oxford, Department of Economics.
    26. Catalina Martinez, 2010. "Insight into Different Types of Patent Families," OECD Science, Technology and Industry Working Papers 2010/2, OECD Publishing.
    27. Harhoff, Dietmar & Reitzig, Markus, 2004. "Determinants of opposition against EPO patent grants--the case of biotechnology and pharmaceuticals," International Journal of Industrial Organization, Elsevier, vol. 22(4), pages 443-480, April.
    28. Eleftherios Sapsalis & Bruno van Pottelsberghe de la Potterie, 2007. "The Institutional Sources Of Knowledge And The Value Of Academic Patents," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 16(2), pages 139-157.
    29. Hall, Bronwyn H & Ziedonis, Rosemarie Ham, 2001. "The Patent Paradox Revisited: An Empirical Study of Patenting in the U.S. Semiconductor Industry, 1979-1995," RAND Journal of Economics, The RAND Corporation, vol. 32(1), pages 101-128, Spring.
    30. Reitzig, Markus, 2004. "Improving patent valuations for management purposes--validating new indicators by analyzing application rationales," Research Policy, Elsevier, vol. 33(6-7), pages 939-957, September.
    31. Hariolf Grupp, 1998. "Foundations of the Economics of Innovation," Books, Edward Elgar Publishing, number 1390.
    32. Guellec, Dominique & Pottelsberghe de la Potterie, Bruno v., 2000. "Applications, grants and the value of patent," Economics Letters, Elsevier, vol. 69(1), pages 109-114, October.
    33. David S. Abrams & Ufuk Akcigit & Jillian Grennan, 2013. "Patent Value and Citations: Creative Destruction or Strategic Disruption?," NBER Working Papers 19647, National Bureau of Economic Research, Inc.
    34. Yann Ménière & Antoine Dechezleprêtre & Matthieu Glachant & Ivan Hascic & N. Johnstone, 2011. "Invention and transfer of climate change mitigation technologies: a study drawing on patent data," Post-Print hal-00869795, HAL.
    35. Bruno Van Pottelsberghe & Herman Denis & Dominique Guellec, 2001. "Using patent counts for cross-country comparisons of technology output," ULB Institutional Repository 2013/6227, ULB -- Universite Libre de Bruxelles.
    36. Antoine Dechezleprêtre & Matthieu Glachant & Ivan Haščič & Nick Johnstone & Yann Ménière, 2011. "Invention and Transfer of Climate Change--Mitigation Technologies: A Global Analysis," Review of Environmental Economics and Policy, Association of Environmental and Resource Economists, vol. 5(1), pages 109-130, Winter.
    37. Sakakibara, Mariko & Branstetter, Lee, 2001. "Do Stronger Patents Induce More Innovation? Evidence from the 1988 Japanese Patent Law Reforms," RAND Journal of Economics, The RAND Corporation, vol. 32(1), pages 77-100, Spring.
    38. Deepak Hegde & David C. Mowery & Stuart J. H. Graham, 2009. "Pioneering Inventors or Thicket Builders: Which U.S. Firms Use Continuations in Patenting?," Management Science, INFORMS, vol. 55(7), pages 1214-1226, July.
    39. Bronwyn H. Hall & Dietmar Harhoff, 2012. "Recent Research on the Economics of Patents," Annual Review of Economics, Annual Reviews, vol. 4(1), pages 541-565, July.
    40. Farre-Mensa, Joan & Hegde, Deepak & Ljungqvist, Alexander P., 2016. "The Bright Side of Patents," CEPR Discussion Papers 11091, C.E.P.R. Discussion Papers.
    41. Rainer Frietsch & Ulrich Schmoch, 2010. "Transnational patents and international markets," Scientometrics, Springer;Akadémiai Kiadó, vol. 82(1), pages 185-200, January.
    42. Jean O. Lanjouw & Ariel Pakes & Jonathan Putnam, 1998. "How to Count Patents and Value Intellectual Property: The Uses of Patent Renewal and Application Data," Journal of Industrial Economics, Wiley Blackwell, vol. 46(4), pages 405-432, December.
    43. Tong, Xuesong & Frame, J. Davidson, 1994. "Measuring national technological performance with patent claims data," Research Policy, Elsevier, vol. 23(2), pages 133-141, March.
    44. Philippe Aghion & Antoine Dechezleprêtre & David Hémous & Ralf Martin & John Van Reenen, 2016. "Carbon Taxes, Path Dependency, and Directed Technical Change: Evidence from the Auto Industry," Journal of Political Economy, University of Chicago Press, vol. 124(1), pages 1-51.
    45. 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.
    46. Harhoff, Dietmar & Scherer, Frederic M. & Vopel, Katrin, 2003. "Citations, family size, opposition and the value of patent rights," Research Policy, Elsevier, vol. 32(8), pages 1343-1363, September.
    47. James Bessen & Michael J. Meurer, 2008. "Introduction to Patent Failure: How Judges, Bureaucrats, and Lawyers Put Innovators at Risk," Introductory Chapters, in: Patent Failure: How Judges, Bureaucrats, and Lawyers Put Innovators at Risk, Princeton University Press.
    48. Nicolas van Zeebroeck, 2011. "The puzzle of patent value indicators," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 20(1), pages 33-62.
    49. Pavitt, Keith, 1982. "R&D, patenting and innovative activities : A statistical exploration," Research Policy, Elsevier, vol. 11(1), pages 33-51, February.
    50. Cohen, Wesley M. & Goto, Akira & Nagata, Akiya & Nelson, Richard R. & Walsh, John P., 2002. "R&D spillovers, patents and the incentives to innovate in Japan and the United States," Research Policy, Elsevier, vol. 31(8-9), pages 1349-1367, December.
    51. Catalina Martínez, 2011. "Patent families: When do different definitions really matter?," Scientometrics, Springer;Akadémiai Kiadó, vol. 86(1), pages 39-63, January.
    52. Gambardella, Alfonso & Harhoff, Dietmar & Verspagen, Bart, 2008. "The Value of European Patents," CEPR Discussion Papers 6848, C.E.P.R. Discussion Papers.
    53. Hélène Dernis & Mosahid Khan, 2004. "Triadic Patent Families Methodology," OECD Science, Technology and Industry Working Papers 2004/2, OECD Publishing.
    54. Eaton, Jonathan & Kortum, Samuel, 1999. "International Technology Diffusion: Theory and Measurement," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 40(3), pages 537-570, August.
    55. Narin, Francis & Noma, Elliot & Perry, Ross, 1987. "Patents as indicators of corporate technological strength," Research Policy, Elsevier, vol. 16(2-4), pages 143-155, August.
    56. Ariel Pakes & Mark Schankerman, 1984. "The Rate of Obsolescence of Patents, Research Gestation Lags, and the Private Rate of Return to Research Resources," NBER Chapters, in: R&D, Patents, and Productivity, pages 73-88, National Bureau of Economic Research, Inc.
    57. 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, April.
    58. Mariagrazia Squicciarini & Hélène Dernis & Chiara Criscuolo, 2013. "Measuring Patent Quality: Indicators of Technological and Economic Value," OECD Science, Technology and Industry Working Papers 2013/3, OECD Publishing.
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    More about this item

    Keywords

    Patent families; Patent value; Priority patents; Continuations; Divisional applications;
    All these keywords.

    JEL classification:

    • O31 - Economic Development, Innovation, Technological Change, and Growth - - Innovation; Research and Development; Technological Change; Intellectual Property Rights - - - Innovation and Invention: Processes and Incentives
    • O34 - Economic Development, Innovation, Technological Change, and Growth - - Innovation; Research and Development; Technological Change; Intellectual Property Rights - - - Intellectual Property and Intellectual Capital

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