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

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  • Albert G.Z. Hu
  • Adam B. Jaffe

Abstract

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.

Suggested Citation

  • Albert G.Z. Hu & Adam B. Jaffe, 2001. "Patent Citations and International Knowledge Flow: The Cases of Korea and Taiwan," NBER Working Papers 8528, National Bureau of Economic Research, Inc.
  • Handle: RePEc:nbr:nberwo:8528
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    References listed on IDEAS

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    1. Adam B. Jaffe & Manuel Trajtenberg & Rebecca Henderson, 1993. "Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations," The Quarterly Journal of Economics, Oxford University Press, vol. 108(3), pages 577-598.
    2. Petri, Peter A., 1988. "Korea's export niche: Origins and prospects," World Development, Elsevier, vol. 16(1), pages 47-63, January.
    3. Adam Jaffe & Manuel Trajtenberg, 1999. "International Knowledge Flows: Evidence From Patent Citations," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 8(1-2), pages 105-136.
    4. Keller, Wolfgang, 2001. "The geography and channels of diffusion at the world's technology frontier," HWWA Discussion Papers 123, Hamburg Institute of International Economics (HWWA).
    5. 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 569-596, September.
    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. 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.
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    JEL classification:

    • O3 - Economic Development, Innovation, Technological Change, and Growth - - Innovation; Research and Development; Technological Change; Intellectual Property Rights

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