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International Knowledge Flows: Evidence from Patent Citations

  • Adam B. Jaffe
  • Manuel Trajtenberg

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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File URL: http://www.nber.org/papers/w6507.pdf
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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
Date of revision:
Publication status: published as Economics of Innovation and New Technology, Vol. 8 (1999): 105-136.
Handle: RePEc:nbr:nberwo:6507
Note: PR
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  1. Zvi Griliches, 1990. "Patent Statistics as Economic Indicators: A Survey," NBER Working Papers 3301, National Bureau of Economic Research, Inc.
  2. Paul M Romer, 1999. "Endogenous Technological Change," Levine's Working Paper Archive 2135, David K. Levine.
  3. Jaffe, Adam B, 1986. "Technological Opportunity and Spillovers of R&D: Evidence from Firms' Patents, Profits, and Market Value," American Economic Review, American Economic Association, vol. 76(5), pages 984-1001, December.
  4. Coe, David T. & Helpman, Elhanan, 1995. "International R&D spillovers," European Economic Review, Elsevier, vol. 39(5), pages 859-887, May.
  5. 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.
  6. Jonathan Eaton & Samuel Kortum, 1995. "Trade in Ideas: Patenting and Productivity in the OECD," NBER Working Papers 5049, National Bureau of Economic Research, Inc.
  7. Grossman, Gene M & Helpman, Elhanan, 1991. "Quality Ladders in the Theory of Growth," Review of Economic Studies, Wiley Blackwell, vol. 58(1), pages 43-61, January.
  8. 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.
  9. 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.
  10. 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.
  11. repec:fth:harver:1473 is not listed on IDEAS
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