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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

  • Kawaura, Akihiko
  • La Croix, Sumner J

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.

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Article provided by Western Economic Association International in its journal Economic Inquiry.

Volume (Year): 33 (1995)
Issue (Month): 1 (January)
Pages: 88-103

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Handle: RePEc:oup:ecinqu:v:33:y:1995:i:1:p:88-103
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  1. Kato, Kiyoshi & Schallheim, James S., 1985. "Seasonal and Size Anomalies in the Japanese Stock Market," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 20(02), pages 243-260, June.
  2. Chalk, Andrew, 1986. "Market Forces and Aircraft Safety: The Case of the DC-10," Economic Inquiry, Western Economic Association International, vol. 24(1), pages 43-60, January.
  3. Keim, Donald B., 1983. "Size-related anomalies and stock return seasonality : Further empirical evidence," Journal of Financial Economics, Elsevier, vol. 12(1), pages 13-32, June.
  4. Fama, Eugene F, et al, 1969. "The Adjustment of Stock Prices to New Information," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 10(1), pages 1-21, February.
  5. Gultekin, Mustafa N. & Gultekin, N. Bulent, 1983. "Stock market seasonality : International Evidence," Journal of Financial Economics, Elsevier, vol. 12(4), pages 469-481, December.
  6. Jarrell, Gregg A & Poulsen, Annette B, 1989. "Stock Trading before the Announcement of Tender Offers: Insider Trading or Market Anticipation?," Journal of Law, Economics and Organization, Oxford University Press, vol. 5(2), pages 225-48, Fall.
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