Identifying the Age Profile of Patent Citations
Aditi Mehta (),
Marc Rysman () and
Tim Simcoe ()
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Aditi Mehta: Department of Economics, Boston University
Tim Simcoe: J.L. Rotman School of Management, University of Toronto
No WP2007-021, Boston University - Department of Economics - Working Papers Series from Boston University - Department of Economics
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.
JEL-codes: L1 O3 (search for similar items in EconPapers)
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Working Paper: Identifying the Age Profile of Patent Citations (2006)
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Persistent link: https://EconPapers.repec.org/RePEc:bos:wpaper:wp2007-021
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