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Patent citations and international knowledge flow : The cases of Korea and Taiwan

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  • Patent citations and international knowledge flow
  • Hu, Albert G.Z.; Jaffe, Adam B.
  • National Bureau of Economic Research


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Title Patent citations and international knowledge flow
Similar Titles
Sub Title

The cases of Korea and Taiwan

Material Type Reports
Author(English)

Hu, Albert G.Z.; Jaffe, Adam B.

Publisher

Cambridge:National Bureau of Economic Research

Date 2001-10
Series Title; No NBER Working Paper Series / 8528
Pages 40
Subject Country South Korea(Asia and Pacific)
Taiwan(Asia and Pacific)
Language English
File Type Link
Original Format pdf
Subject Industry and Technology < General
Holding National Bureau of Economic Research

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.