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Identifying the Age Profile of Patent Citations

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Author Info
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)

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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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Publisher 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
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Handle: RePEc:bos:wpaper:wp2007-021

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Find related papers by JEL classification:
L1 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance
O3 - Economic Development, Technological Change, and Growth - - Technological Change

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. Marco, Alan C., 2007. "The dynamics of patent citations," Economics Letters, Elsevier, vol. 94(2), pages 290-296, February. [Downloadable!] (restricted)
    Other versions:
  2. 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. [Downloadable!] (restricted)
  3. Hall, Bronwyn H. & Mairesse, Jacques & Turner, Laure, 2006. "Identifying Age, Cohort and Period Effects in Scientific Research Productivity - Discussion and Illustration Using Simulated and Actual Data on French Physicists," UNU-MERIT Working Paper Series 042, United Nations University, Maastricht Economic and social Research and training centre on Innovation and Technology. [Downloadable!]
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  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. 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. [Downloadable!] (restricted)
  6. David Popp & Ted Juhl & Daniel Johnson, 2004. "Time In Purgatory: Examining the Grant Lag for U.S. Patent Applications," Topics in Economic Analysis & Policy, Berkeley Electronic Press, vol. 4(1), pages 1329-1329. [Downloadable!] (restricted)
  7. 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. [Downloadable!]
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  8. 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. [Downloadable!]
  9. Benjamin F. Jones, 2005. "Age and Great Invention," NBER Working Papers 11359, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  10. Jaffe, Adam B & Trajtenberg, Manuel & Henderson, Rebecca, 1993. "Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations," The Quarterly Journal of Economics, MIT Press, vol. 108(3), pages 577-98, August. [Downloadable!] (restricted)
    Other versions:
  11. 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)
  12. 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.
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  13. 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. [Downloadable!] (restricted)
  14. 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. [Downloadable!] (restricted)
  15. 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. [Downloadable!] (restricted)
  16. Angrist, Joshua D, 2001. "Estimations of Limited Dependent Variable Models with Dummy Endogenous Regressors: Simple Strategies for Empirical Practice," Journal of Business & Economic Statistics, American Statistical Association, vol. 19(1), pages 2-16, January.
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  17. Marc Rysman & Tim Simcoe, 2005. "Patents and the Performance of Voluntary Standard Setting Organizations," Working Papers 05-22, NET Institute, revised Oct 2005. [Downloadable!]
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  18. Adam B. Jaffe & Manuel Trajtenberg & 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. [Downloadable!] (restricted)
  19. Fabio Montobbio & E. Bacchiocchi, 2004. "EPO vs. USPTO Citation Lags," CESPRI Working Papers 161, CESPRI, Centre for Research on Innovation and Internationalisation, Universita' Bocconi, Milano, Italy, revised Sep 2004. [Downloadable!]
  20. 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. [Downloadable!]
    Other versions:
  21. Kortum, Samuel & Lerner, Josh, 1999. "What is behind the recent surge in patenting?1," Research Policy, Elsevier, vol. 28(1), pages 1-22, January. [Downloadable!] (restricted)
Full references

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. 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. [Downloadable!]
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