IDEAS home Printed from
   My bibliography  Save this paper

Science linkages in technologies patented in Japan


  • Schumpeter Tamada
  • Yusuke Naito
  • Kiminori Gemba
  • Fumio Kodama
  • Jun Suzuki
  • Akira Goto


We constructed an original database concerning science linkages based on text of Japanese Patent Gazette published since 1994. We discovered that Japanese inventers cite many academic papers in the texts of the patent applications in the Japanese Patent System. Based on this finding, we constructed science citation index by data mining the texts of Japanese patent system for the first time. First, more than 880,000 patent data classified into about 600 categories. Then, we extracted non-patent references from all the granted patents and counted the number of them. This number shows the strength of the linkage between science and technology and therefore is called "science linkage index." The science linkage indexes among different patent classifications differ significantly from each other. The technologies related to bio -technology were by far the closest to science. It suggests that the process of creating new technology differs from technology to technology.

Suggested Citation

  • Schumpeter Tamada & Yusuke Naito & Kiminori Gemba & Fumio Kodama & Jun Suzuki & Akira Goto, 2004. "Science linkages in technologies patented in Japan," Discussion papers 04034, Research Institute of Economy, Trade and Industry (RIETI).
  • Handle: RePEc:eti:dpaper:04034

    Download full text from publisher

    File URL:
    Download Restriction: no


    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.

    Cited by:

    1. Kodama, Fumio & Suzuki, Jun, 2007. "How Japanese Companies have used Scientific Advances to Restructure their Businesses: The Receiver-Active National System of Innovation," World Development, Elsevier, vol. 35(6), pages 976-990, June.

    More about this item

    NEP fields

    This paper has been announced in the following NEP Reports:


    Access and download statistics


    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eti:dpaper:04034. See general information about how to correct material in RePEc.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (TANIMOTO, Toko). General contact details of provider: .

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service hosted by the Research Division of the Federal Reserve Bank of St. Louis . RePEc uses bibliographic data supplied by the respective publishers.