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Identifying the Age Profile of Patent Citations

  • Aditi Mehta

    ()

    (Department of Economics, Boston University)

  • Marc Rysman

    ()

    (Department of Economics, Boston University)

  • Tim Simcoe

    ()

    (J.L. Rotman School of Management, University of Toronto)

Previous work studying the age distribution of citations for patents relies on functional form assumptions to address the co-linearity between the birth year, citation year, and age. This paper proposes a non-parametric identification strategy that uses the lag between application and grant as a source of exogenous variation. We show empirically that the “citation clock” starts only when a patent issues, and we examine the potential bias if our assumption is incorrect. We use our approach to re-examine some prior results on the citation age profile of patents from different technological fields. We discuss potential extensions into other research areas.

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Paper provided by Boston University - Department of Economics in its series Boston University - Department of Economics - Working Papers Series with number WP2007-021.

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Length: 21pages
Date of creation: Mar 2007
Date of revision:
Handle: RePEc:bos:wpaper:wp2007-021
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  7. Johnson, Daniel K N & Popp, David, 2003. " Forced Out of the Closet: The Impact of the American Inventors Protection Act on the Timing of Patent Disclosure," RAND Journal of Economics, The RAND Corporation, vol. 34(1), pages 96-112, Spring.
  8. Jaffe, A.B. & Trajtenberg, M., 1998. "International Knowledge Flows: Evidence from Patent Citation," Papers 11-98, Tel Aviv.
  9. Bronwyn H. Hall & Jacques Mairesse & Laure Turner, 2005. "Identifying Age, Cohort and Period Effects in Scientific Research Productivity: Discussion and Illustration Using Simulated and Actual Data on French Physicists," NBER Working Papers 11739, National Bureau of Economic Research, Inc.
  10. Kortum, Samuel & Lerner, Josh, 1999. "What is behind the recent surge in patenting?1," Research Policy, Elsevier, vol. 28(1), pages 1-22, January.
  11. Peter Thompson & Melanie Fox-Kean, 2005. "Patent Citations and the Geography of Knowledge Spillovers: A Reassessment," American Economic Review, American Economic Association, vol. 95(1), pages 450-460, March.
  12. Joshua Angrist, 1999. "Estimation of Limited-Dependent Variable Models with Dummy Endogenous Regressors: Simple Strategies for Empirical Practice," Working papers 99-31, Massachusetts Institute of Technology (MIT), Department of Economics.
  13. Joshua S. Gans & David H. Hsu & Scott Stern, 2008. "The Impact of Uncertain Intellectual Property Rights on the Market for Ideas: Evidence from Patent Grant Delays," Management Science, INFORMS, vol. 54(5), pages 982-997, May.
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  15. Peter Thompson & Melanie Fox-Kean, 2005. "Patent Citations and the Geography of Knowledge Spillovers: A Reassessment: Reply," American Economic Review, American Economic Association, vol. 95(1), pages 465-466, March.
  16. 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.
  17. Manuel Trajtenberg & Adam B. Jaffe & Michael S. Fogarty, 2000. "Knowledge Spillovers and Patent Citations: Evidence from a Survey of Inventors," American Economic Review, American Economic Association, vol. 90(2), pages 215-218, May.
  18. Albert, M. B. & Avery, D. & Narin, F. & McAllister, P., 1991. "Direct validation of citation counts as indicators of industrially important patents," Research Policy, Elsevier, vol. 20(3), pages 251-259, June.
  19. Benjamin F. Jones, 2005. "Age and Great Invention," NBER Working Papers 11359, National Bureau of Economic Research, Inc.
  20. Iain M. Cockburn & Samuel Kortum & Scott Stern, 2002. "Are All Patent Examiners Equal? The Impact of Examiner Characteristics," NBER Working Papers 8980, National Bureau of Economic Research, Inc.
  21. Fabio Montobbio & E. Bacchiocchi, 2004. "EPO vs. USPTO Citation Lags," KITeS Working Papers 161, KITeS, Centre for Knowledge, Internationalization and Technology Studies, Universita' Bocconi, Milano, Italy, revised Sep 2004.
  22. Murray, Fiona & Stern, Scott, 2007. "Do formal intellectual property rights hinder the free flow of scientific knowledge?: An empirical test of the anti-commons hypothesis," Journal of Economic Behavior & Organization, Elsevier, vol. 63(4), pages 648-687, August.
  23. Rysman, Marc & Simcoe, Tim, 2009. "Patents and the Performance of Voluntary Standard Setting Organizations," PIE/CIS Discussion Paper 418, Center for Intergenerational Studies, Institute of Economic Research, Hitotsubashi University.
  24. Popp David & Juhl Ted & Johnson Daniel K.N., 2004. "Time In Purgatory: Examining the Grant Lag for U.S. Patent Applications," The B.E. Journal of Economic Analysis & Policy, De Gruyter, vol. 4(1), pages 1-45, November.
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