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Patent Citations and the Geography of Knowledge Spillovers: Evidence from Inventor- and Examiner-added Citations

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  • Peter Thompson

Abstract

I report new evidence for localized knowledge spillovers identified by within-patent variations in the geographic matching rates of citations added by inventors and citations added by examiners. Evaluated at the mean citation lag, inventor citations are 20% more likely than examiner citations to match the country of origin of their citing patent, whereas U.S. inventor citations are 25% more likely to match the state or metropolitan area of their citing patent. The localization of intranational knowledge spillovers declines with the passage of time, but international borders present a persistent barrier to spillovers. Copyright by the President and Fellows of Harvard College and the Massachusetts Institute of Technology.

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  • Peter Thompson, 2006. "Patent Citations and the Geography of Knowledge Spillovers: Evidence from Inventor- and Examiner-added Citations," The Review of Economics and Statistics, MIT Press, vol. 88(2), pages 383-388, May.
  • Handle: RePEc:tpr:restat:v:88:y:2006:i:2:p:383-388
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