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Identifying the Age Profile of Patent Citations

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  • 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)

Abstract

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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Bibliographic Info

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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References

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  1. Peter Thompson & Melanie Fox Kean, 2004. "Patent Citations and the Geography of Knowledge Spillovers: A Reassessment," Working Papers 0401, Florida International University, Department of Economics.
  2. Kortum, Samuel & Lerner, Josh, 1999. "What is behind the recent surge in patenting?1," Research Policy, Elsevier, vol. 28(1), pages 1-22, January.
  3. 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.
  4. Joshua D. Angrist, 2000. "Estimation of Limited-Dependent Variable Models with Dummy Endogenous Regressors: Simple Strategies for Empirical Practice," NBER Technical Working Papers 0248, National Bureau of Economic Research, Inc.
  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.
  6. Marc Rysman & Timothy Simcoe, 2008. "Patents and the Performance of Voluntary Standard-Setting Organizations," Management Science, INFORMS, vol. 54(11), pages 1920-1934, November.
  7. Benjamin F. Jones, 2005. "Age and Great Invention," NBER Working Papers 11359, National Bureau of Economic Research, Inc.
  8. Marco, Alan C., 2007. "The dynamics of patent citations," Economics Letters, Elsevier, vol. 94(2), pages 290-296, February.
  9. 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.
  10. Bronwyn Hall & Jacques Mairesse & Laure Turner, 2007. "Identifying Age, Cohort, And Period Effects In Scientific Research Productivity: Discussion And Illustration Using Simulated And Actual Data On French Physicists," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 16(2), pages 159-177.
  11. 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.
  12. Ricardo J. Caballero & Adam B. Jaffe, 1993. "How High are the Giants' Shoulders: An Empirical Assessment of Knowledge Spillovers and Creative Destruction in a Model of Economic Growth," NBER Chapters, in: NBER Macroeconomics Annual 1993, Volume 8, pages 15-86 National Bureau of Economic Research, Inc.
  13. Joshua S. Gans & David H. Hsu & Scott Stern, 2007. "The Impact of Uncertain Intellectual Property Rights on the Market For Ideas: Evidence From Patent Grant Delays," NBER Working Papers 13234, National Bureau of Economic Research, Inc.
  14. 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.
  15. Adam B. Jaffe & Manuel Trajtenberg, 1998. "International Knowledge Flows: Evidence from Patent Citations," NBER Working Papers 6507, National Bureau of Economic Research, Inc.
  16. 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.
  17. 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.
  18. Jaffe, A.B. & Trajtenberg, M., 1992. "Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations," Papers 14-92, Tel Aviv.
  19. Lee Branstetter & Yoshiaki Ogura, 2005. "Is Academic Science Driving a Surge in Industrial Innovation? Evidence from Patent Citations," NBER Working Papers 11561, 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. Juan Alcácer & Michelle Gittelman, 2006. "Patent Citations as a Measure of Knowledge Flows: The Influence of Examiner Citations," The Review of Economics and Statistics, MIT Press, vol. 88(4), pages 774-779, November.
  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. 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.
  24. 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.
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Cited by:
  1. Ufuk Akcigit & William R. Kerr, 2010. "Growth Through Heterogeneous Innovations," NBER Working Papers 16443, National Bureau of Economic Research, Inc.
  2. Robert A. Margo, 2010. "The Economic History of the American Economic Review : A Century's Explosion of Economics Research," NBER Working Papers 16274, National Bureau of Economic Research, Inc.
  3. Travaglini, Guido, 2008. "Dynamic GMM Estimation With Structural Breaks. An Application to Global Warming and its Causes," MPRA Paper 7108, University Library of Munich, Germany.

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