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Identifying the Age Profile of Patent Citations

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  • Aditi Mehta

    ()
    (Boston University, Department of Economics)

  • Marc Rysman

    ()
    (Boston University, Department of Economics)

  • Tim Simcoe

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.

(This abstract was borrowed from another version of this item.)

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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 WP2006-022.

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Length: pages
Date of creation: Mar 2006
Date of revision:
Handle: RePEc:bos:wpaper:wp2006-022

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  14. 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 Working Papers 4370, National Bureau of Economic Research, Inc.
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  20. 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.
  21. 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.
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  23. 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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Cited by:
  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.
  2. Akcigit, Ufuk & Kerr, William R., 2013. "Growth through heterogeneous innovations," Research Discussion Papers 28/2013, Bank of Finland.
  3. 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.

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