International Knowledge Flows: Evidence from Patent Citations

Adam Jaffe and Manuel Trajtenberg

No 6507, NBER Working Papers from National Bureau of Economic Research, Inc

Abstract: This paper explores the patterns of citations among patents taken out by inventors in the U.S., the U.K., France, Germany and Japan. We find (1) patents assigned to the same firm are more likely to cite each other, and come sooner than other citations; (2) patents in the same patent class are approximately 100 times as likely to cite each other as patents from different patent classes there is not a strong time pattern to this effect; (3) patents whose inventors reside in the same country are typically 30 to 80% more likely to cite each other than inventors from other countries, and these citations come sooner; and (4) there are clear country-specific citation tendencies; e.g., Japanese citations typically come sooner than those of other countries.

JEL-codes: O31 (search for similar items in EconPapers)
Date: 1998-04
Note: PR
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (149)

Published as Economics of Innovation and New Technology, Vol. 8 (1999): 105-136.

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Related works:
Journal Article: International Knowledge Flows: Evidence From Patent Citations (1999)
Working Paper: International Knowledge Flows: Evidence from Patent Citation (1998)
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