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

Autores: Peter Thompson
Localización: The Review of economics and statistics, ISSN 0034-6535, Vol. 88, Nº 2, 2006, págs. 383-388
Idioma: inglés
DOI: 10.1162/rest.88.2.383
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Resumen
- 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.