Flows of Knowledge from Universities and Federal Labs: Modeling the Flowof Patent Citations Over Time and Across Institutional and Geographic Boundari

31 Pages Posted: 30 Aug 2000 Last revised: 12 Aug 2022

See all articles by Adam B. Jaffe

Adam B. Jaffe

Brandeis University; Motu Economic and Public Policy Research; National Bureau of Economic Research (NBER)

Manuel Trajtenberg

Tel Aviv University - Eitan Berglas School of Economics; Centre for Economic Policy Research (CEPR); National Bureau of Economic Research (NBER)

Date Written: August 1996

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. This paper develops 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 obsolescence functions. The results indicate that diffusion is geographically localized. Controlling for other factors, within-country citations are more numerous and come more quickly than those that cross country boundaries.

Suggested Citation

Jaffe, Adam B. and Trajtenberg, Manuel, Flows of Knowledge from Universities and Federal Labs: Modeling the Flowof Patent Citations Over Time and Across Institutional and Geographic Boundari (August 1996). NBER Working Paper No. w5712, Available at SSRN: https://ssrn.com/abstract=225580

Adam B. Jaffe (Contact Author)

Brandeis University ( email )

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Manuel Trajtenberg

Tel Aviv University - Eitan Berglas School of Economics ( email )

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