Patent Citations and the Geography of Knowledge Spillovers: Evidence from Inventor- and Examiner-added Citations
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.
Year of publication: |
2006
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Authors: | Thompson, Peter |
Published in: |
The Review of Economics and Statistics. - MIT Press. - Vol. 88.2006, 2, p. 383-388
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Publisher: |
MIT Press |
Saved in:
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