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Patent Citations and International Knowledge Flow: The Cases of Korea and Taiwan

  • Albert G.Z. Hu
  • Adam B. Jaffe

This paper examines patterns of knowledge diffusion from US and Japan to Korea and Taiwan using patent citations as an indicator of knowledge flow. We estimate a knowledge diffusion model using a data set of all patents granted in the U.S. to inventors residing in these four countries. Explicitly modeling the roles of technology proximity and knowledge decay and knowledge diffusion over time, we have found that knowledge diffusion from US and Japan to Korea and Taiwan exhibits quite different patterns. It is much more likely for Korean patents to cite Japanese patents than US patents, whereas Taiwanese inventors tend to learn evenly from both US and Japanese inventors. The frequency of a Korean patent citing a Japanese patent is almost twice that of the frequency of a Taiwanese patent citing a Japanese patent. We also find that a patent is much more likely to cite a patent from its own technological field than from another field.

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File URL: http://www.nber.org/papers/w8528.pdf
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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 8528.

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Date of creation: Oct 2001
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Publication status: published as Hu, Albert G. Z. & Jaffe, Adam B., 2003. "Patent citations and international knowledge flow: the cases of Korea and Taiwan," International Journal of Industrial Organization, Elsevier, vol. 21(6), pages 849-880, June.
Handle: RePEc:nbr:nberwo:8528
Note: PR
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  1. Cohen, Wesley M & Levinthal, Daniel A, 1989. "Innovation and Learning: The Two Faces of R&D," Economic Journal, Royal Economic Society, vol. 99(397), pages 569-96, September.
  2. Wolfgang Keller, 2001. "The Geography and Channels of Diffusion at the World's Technology Frontier," NBER Working Papers 8150, National Bureau of Economic Research, Inc.
  3. Jaffe, A.B. & Trajtenberg, M., 1998. "International Knowledge Flows: Evidence from Patent Citation," Papers 11-98, Tel Aviv.
  4. Jaffe, Adam B & Trajtenberg, Manuel & Henderson, Rebecca, 1993. "Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations," The Quarterly Journal of Economics, MIT Press, vol. 108(3), pages 577-98, August.
  5. Chou, Tein Chen, 1988. "American and Japanese Direct Foreign Investment in Taiwan : A Comparative Study," Hitotsubashi Journal of Economics, Hitotsubashi University, vol. 29(2), pages 165-179, December.
  6. Manuel Trajtenberg & Adam B. Jaffe & Michael S. Fogarty, 2000. "Knowledge Spillovers and Patent Citations: Evidence from a Survey of Inventors," American Economic Review, American Economic Association, vol. 90(2), pages 215-218, May.
  7. Petri, Peter A., 1988. "Korea's export niche: Origins and prospects," World Development, Elsevier, vol. 16(1), pages 47-63, January.
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