Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations

Posted: 17 Nov 2009

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)

Rebecca Henderson

affiliation not provided to SSRN

Multiple version iconThere are 2 versions of this paper

Date Written: 1993

Abstract

Explores the geographic localization of knowledge spillover by comparing the location of inventors of citing patents to the location of the inventors of the patents they cite. The originating patents considered were from 1975 and 1980 and included all patents granted to U.S. universities and two samples from U.S. corporations. The citing patents were identified as of the end of 1989. Self-citations, that is when the owner of a cited patent is the same as the owner of the citing patent, are distinguished in this analysis. Results for the 1980 patents indicate that there is a definite and statistically significant pattern of localization at the country, state, and metropolitan statistical areas. The same pattern occurs for the 1975 patents, but it is at a weaker level. Further, the results show that localization fades over time though slowly. Technological area of the patent appears to have little impact on localization, nor is there a large difference in knowledge flows between patents held by universities and those held by corporations. Further investigation into the mechanisms of knowledge transfer is necessary, as this analysis was limited by the patent and citation data. (SRD)

Keywords: Knowledge spillovers, Patents, Geography, Localization, Patent ownership, Knowledge transfer

Suggested Citation

Jaffe, Adam B. and Trajtenberg, Manuel and Henderson, Rebecca, Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations (1993). University of Illinois at Urbana-Champaign's Academy for Entrepreneurial Leadership Historical Research Reference in Entrepreneurship, Available at SSRN: https://ssrn.com/abstract=1504457

Adam B. Jaffe (Contact Author)

Brandeis University ( email )

Waltham, MA 02454-9110
United States
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781-736-2263 (Fax)

HOME PAGE: http://www.brandeis.edu/global/people/faculty/jaff

Motu Economic and Public Policy Research ( email )

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HOME PAGE: http://motu.org.nz

National Bureau of Economic Research (NBER)

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Manuel Trajtenberg

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

P.O. Box 39040
Ramat Aviv, Tel Aviv, 69978
Israel
+972 3640 9911 (Phone)
+972 3640 9908 (Fax)

Centre for Economic Policy Research (CEPR)

London
United Kingdom

National Bureau of Economic Research (NBER)

1050 Massachusetts Avenue
Cambridge, MA 02138
United States

Rebecca Henderson

affiliation not provided to SSRN

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