NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

International Knowledge Flows: Evidence from Patent Citations

Adam B. Jaffe, Manuel Trajtenberg

NBER Working Paper No. 6507
Issued in April 1998
NBER Program(s):   PR

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.

download in pdf format
   (1542 K)

email paper

This paper is available as PDF (1542 K) or via email.

Machine-readable bibliographic record - MARC, RIS, BibTeX

Document Object Identifier (DOI): 10.3386/w6507

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

Users who downloaded this paper also downloaded these:
Hall, Jaffe, and Trajtenberg w8498 The NBER Patent Citation Data File: Lessons, Insights and Methodological Tools
Hall, Jaffe, and Trajtenberg w7741 Market Value and Patent Citations: A First Look
Hu and Jaffe w8528 Patent Citations and International Knowledge Flow: The Cases of Korea and Taiwan
Jaffe and Trajtenberg w5712 Flows of Knowledge from Universities and Federal Labs: Modeling the Flowof Patent Citations Over Time and Across Institutional and Geographic Boundari
Jaffe, Trajtenberg, and Henderson w3993 Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations
 
Publications
Activities
Meetings
NBER Videos
Data
People
About

Support
National Bureau of Economic Research, 1050 Massachusetts Ave., Cambridge, MA 02138; 617-868-3900; email: info@nber.org

Contact Us