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Patent Citations and the Geography of Knowledge Spillovers: A Reassessment: Reply

✍ Scribed by Peter Thompson and Melanie Fox-Kean


Book ID
125669372
Publisher
American Economic Association
Year
2005
Tongue
English
Weight
270 KB
Volume
95
Category
Article
ISSN
0002-8282

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## Abstract Previous research studies the age profile of patent citations to learn about knowledge flows over time. However, identification is problematic because of the collinearity between application year, citation year, and patent age. We show empirically that a patent's β€˜citation clock’ does n