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

Albert Guangzhou Hu and Adam Jaffe

No 8528, NBER Working Papers from National Bureau of Economic Research, Inc

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.

JEL-codes: O3 (search for similar items in EconPapers)
Date: 2001-10
New Economics Papers: this item is included in nep-dev, nep-ino, nep-sea and nep-tid
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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.

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Journal Article: Patent citations and international knowledge flow: the cases of Korea and Taiwan (2003)
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