International Knowledge Flows: Evidence from Patent Citation

Adam Jaffe and Manuel Trajtenberg

Working Papers from Tel Aviv

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 that, (1) Patets assigned to the same firm are more likely to cit each other, and come sooner that 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, but there is not a strong time pattern to this effect; (3) patents whose investors reside in the same country are typically 30 to 80% more likely to cite each other than inventors from other countries, and these, 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.

Keywords: PATENTS; CITATIONS; SPILLOVERS (search for similar items in EconPapers)
JEL-codes: O30 O31 (search for similar items in EconPapers)
Pages: 37 pages
Date: 1998
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Citations: View citations in EconPapers (39)

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Related works:
Journal Article: International Knowledge Flows: Evidence From Patent Citations (1999)
Working Paper: International Knowledge Flows: Evidence from Patent Citations (1998)
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Persistent link: https://EconPapers.repec.org/RePEc:fth:teavfo:11-98

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