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Japan's Shift from Process to Product Patents in the Pharmaceutical Industry: An Event Study of the Impact on Japanese Firms

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  • Kawaura, Akihiko
  • La Croix, Sumner J

Abstract

In 1975, Japan expanded the scope of its patent law by introducing product patents for newly developed chemical and pharmaceutical products. The authors use rate-of-return data from the Tokyo Stock Exchange for Japanese pharmaceutical companies to examine the impact of the change in the patent law. Their empirical findings indicate that the passage of the new patent law induced an excess return of approximately 26 percent to a portfolio of large pharmaceutical companies. Companies with R&D programs specializing in new product development experienced large gains, while companies with R&D programs specializing in imitative process patents experienced no gains. Copyright 1995 by Oxford University Press.

Suggested Citation

  • Kawaura, Akihiko & La Croix, Sumner J, 1995. "Japan's Shift from Process to Product Patents in the Pharmaceutical Industry: An Event Study of the Impact on Japanese Firms," Economic Inquiry, Western Economic Association International, vol. 33(1), pages 88-103, January.
    • Handle: RePEc:oup:ecinqu:v:33:y:1995:i:1:p:88-103
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    Cited by:

    1. Ming Liu & Sumner la Croix, 2013. "A Cross-Country Index of Intellectual Property Rights in Pharmaceutical Innovations," Working Papers 201313, University of Hawaii at Manoa, Department of Economics.
    2. Sumner J. La Croix & Denise Eby Konan, 2002. "Intellectual Property Rights in China: The Changing Political Economy of Chinese–American Interests," The World Economy, Wiley Blackwell, vol. 25(6), pages 759-788, June.
    3. Gamba, Simona, 2017. "The Effect of Intellectual Property Rights on Domestic Innovation in the Pharmaceutical Sector," World Development, Elsevier, vol. 99(C), pages 15-27.
    4. Ming Liu & Sumner LaCroix, 2011. "The Impact of Stronger Property Rights in Pharmaceuticals on Innovation in Developed and Developing Countries," Working Papers 201116, University of Hawaii at Manoa, Department of Economics.
    5. Jörg Mahlich, 2010. "Patents and performance in the Japanese pharmaceutical industry: An institution-based view," Asia Pacific Journal of Management, Springer, vol. 27(1), pages 99-113, March.
    6. Sumner La Croix, 1994. "Korea's Shift from Process to Product Patents in the Pharmaceutical Industry: An Event Study of the Impact of American Pressure on Korean Film," Working Papers 199402, University of Hawaii at Manoa, Department of Economics.
    7. Nahoko Mitsuyama, 2013. "Stock Market Reaction to Patent Value in Japan: an Event Study Analysis," Journal of Knowledge Management, Economics and Information Technology, ScientificPapers.org, vol. 3(6), pages 1-12, December.

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