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Identifying the age profile of patent citations: new estimates of knowledge diffusion

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  • Aditi Mehta
  • Marc Rysman
  • Tim Simcoe

Abstract

Previous research studies the age profile of patent citations to learn about knowledge flows over time. However, identification is problematic because of the collinearity between application year, citation year, and patent age. We show empirically that a patent's ‘citation clock’ does not start until it issues, and propose a highly flexible identification strategy that uses the lag between application and grant as a source of exogenous variation. We examine the potential bias if our assumptions are incorrect, and discuss extensions into other research areas. Finally, we use our method to re-examine prior results on citation age profiles of patents from different technological fields and application year cohorts. Copyright (C) 2009 John Wiley & Sons, Ltd.

Suggested Citation

  • Aditi Mehta & Marc Rysman & Tim Simcoe, 2010. "Identifying the age profile of patent citations: new estimates of knowledge diffusion," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 25(7), pages 1179-1204, November/.
  • Handle: RePEc:jae:japmet:v:25:y:2010:i:7:p:1179-1204
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    File URL: http://hdl.handle.net/10.1002/jae.1086
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    Citations

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    Cited by:

    1. David L. Anderson & John Tressler, 2016. "The Impact of Citation Timing: A Framework and Examples," Working Papers in Economics 16/04, University of Waikato.
    2. repec:bla:jinfst:v:68:y:2017:i:6:p:1360-1374 is not listed on IDEAS
    3. Raven, Michael & Blind, Knut, 2017. "The characteristics and impacts of scientific publications in biotechnology research referenced in standards," Technological Forecasting and Social Change, Elsevier, vol. 115(C), pages 167-179.
    4. Catherine Tucker, 2012. "Patent Trolls and Technology Diffusion," NBER Chapters,in: Standards, Patents and Innovations National Bureau of Economic Research, Inc.
    5. Jasjit Singh & Ajay Agrawal, 2011. "Recruiting for Ideas: How Firms Exploit the Prior Inventions of New Hires," Management Science, INFORMS, vol. 57(1), pages 129-150, January.
    6. Sandner, Philipp G. & Block, Joern, 2011. "The market value of R&D, patents, and trademarks," Research Policy, Elsevier, vol. 40(7), pages 969-985, September.
    7. L. Kamran Bilir, 2014. "Patent Laws, Product Life-Cycle Lengths, and Multinational Activity," American Economic Review, American Economic Association, vol. 104(7), pages 1979-2013, July.
    8. repec:bla:stratm:v:38:y:2017:i:9:p:1791-1811 is not listed on IDEAS
    9. Ruimin Ma & Erjia Yan, 2016. "Uncovering inter-specialty knowledge communication using author citation networks," Scientometrics, Springer;Akadémiai Kiadó, vol. 109(2), pages 839-854, November.
    10. repec:wsi:ijimxx:v:21:y:2017:i:01:n:s1363919617500013 is not listed on IDEAS
    11. Baron, Justus & Ménière, Yann & Pohlmann, Tim, 2014. "Standards, consortia, and innovation," International Journal of Industrial Organization, Elsevier, vol. 36(C), pages 22-35.
    12. Adam B. Jaffe & Gaétan de Rassenfosse, 2017. "Patent citation data in social science research: Overview and best practices," Journal of the Association for Information Science & Technology, Association for Information Science & Technology, vol. 68(6), pages 1360-1374, June.
    13. Agrawal, Ajay & Galasso, Alberto & Oettl, Alexander, 2014. "Roads and Innovation," CEPR Discussion Papers 10113, C.E.P.R. Discussion Papers.
    14. Alberto Galasso & Timothy S. Simcoe, 2011. "CEO Overconfidence and Innovation," Management Science, INFORMS, vol. 57(8), pages 1469-1484, August.
    15. Tucker, C.E., 2012. "Institutions, competition and regulation : Intellectual property and innovation," Discussion Paper 2012-030, Tilburg University, Tilburg Law and Economic Center.
    16. Ryan L. Lampe & Petra Moser, 2012. "Do Patent Pools Encourage Innovation? Evidence from 20 U.S. Industries under the New Deal," NBER Working Papers 18316, National Bureau of Economic Research, Inc.
    17. Mastrogiorgio, Mariano & Gilsing, Victor, 2016. "Innovation through exaptation and its determinants: The role of technological complexity, analogy making & patent scope," Research Policy, Elsevier, vol. 45(7), pages 1419-1435.
    18. Yan, Erjia & Ding, Ying & Cronin, Blaise & Leydesdorff, Loet, 2013. "A bird's-eye view of scientific trading: Dependency relations among fields of science," Journal of Informetrics, Elsevier, vol. 7(2), pages 249-264.

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