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International Knowledge Flows: Evidence from Patent Citations

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  • Adam B. Jaffe
  • Manuel Trajtenberg

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.

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Bibliographic Info

Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 6507.

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Date of creation: Apr 1998
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Publication status: published as Economics of Innovation and New Technology, Vol. 8 (1999): 105-136.
Handle: RePEc:nbr:nberwo:6507

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  1. Teece, David J, 1977. "Technology Transfer by Multinational Firms: The Resource Cost of Transferring Technological Know-how," Economic Journal, Royal Economic Society, vol. 87(346), pages 242-61, June.
  2. Adam B. Jaffe, 1986. "Technological Opportunity and Spillovers of R&D: Evidence from Firms' Patents, Profits and Market Value," NBER Working Papers 1815, National Bureau of Economic Research, Inc.
  3. Jaffe, Adam B & Fogarty, Michael S & Banks, Bruce A, 1998. "Evidence from Patents and Patent Citations on the Impact of NASA and Other Federal Labs on Commercial Innovation," Journal of Industrial Economics, Wiley Blackwell, vol. 46(2), pages 183-205, June.
  4. Paul M Romer, 1999. "Endogenous Technological Change," Levine's Working Paper Archive 2135, David K. Levine.
  5. Coe, D.T. & Helpman, E., 1993. "International R&D Spillovers," Papers 5-93, Tel Aviv.
  6. Eaton, Jonathan & Kortum, Samuel, 1996. "Trade in ideas Patenting and productivity in the OECD," Journal of International Economics, Elsevier, vol. 40(3-4), pages 251-278, May.
  7. repec:fth:harver:1473 is not listed on IDEAS
  8. Park, Walter G, 1995. "International R&D Spillovers and OECD Economic Growth," Economic Inquiry, Western Economic Association International, vol. 33(4), pages 571-91, October.
  9. Zvi Griliches, 1998. "Patent Statistics as Economic Indicators: A Survey," NBER Chapters, in: R&D and Productivity: The Econometric Evidence, pages 287-343 National Bureau of Economic Research, Inc.
  10. Grossman, G.M. & Helpman, E., 1989. "Quality Ledders In The Theory Of Growth," Papers 148, Princeton, Woodrow Wilson School - Public and International Affairs.
  11. Ricardo J. Caballero & Adam B. Jaffe, 1993. "How High are the Giants' Shoulders: An Empirical Assessment of Knowledge Spillovers and Creative Destruction in a Model of Economic Growth," NBER Chapters, in: NBER Macroeconomics Annual 1993, Volume 8, pages 15-86 National Bureau of Economic Research, Inc.
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