Flows of knowledge from universities and federal laboratories: Modeling the flow of patent citations over time and across institutional and geographic boundaries

Adam B. Jaffe*, Manuel Trajtenberg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The extent to which new technological knowledge flows across institutional and national boundaries is a question of great importance for public policy and the modeling of economic growth. In this paper we develop a model of the process generating subsequent citations to patents as a lens for viewing knowledge diffusion. We find that the probability of patent citation over time after a patent is granted fits well to a double-exponential function that can be interpreted as the mixture of diffusion and obsolescense functions. The results indicate that diffusion is geographically localized. Controlling for other factors, within-country citations are inure numerous and come more quickly than those that cross country boundaries.

Original languageEnglish
Pages (from-to)12671-12677
Number of pages7
JournalProceedings of the National Academy of Sciences of the United States of America
Volume93
Issue number23
DOIs
StatePublished - 12 Nov 1996

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