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Post-Issue Patent "Quality Control": A Comparative Study of US Patent Re-examinations and European Patent Oppositions

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Author Info

  • Stuart J. H. Graham

    (University of California, Berkeley)

  • Bronwyn H. Hall

    (University of California, Berkeley & NBER)

  • Dietmar Harhoff

    (Ludwig-Maximilians-Universität München & CEPR)

  • David C. Mowery

    (University of California, Berkeley & NBER)

Abstract

We report the results of the first comparative study of the determinants and effects of patent oppositions in Europe and of re- examinations on corresponding patents issued in the United States. The analysis is based on a dataset consisting of matched EPO and US patents. Our analysis focuses on two broad technology categories - biotechnology and pharmaceuticals, and semiconductors and computer software. Within these fields, we collect data on all EPO patents for which oppositions were filed at the EPO. We also construct a random sample of EPO patents with no opposition in these technologies. We match these EPO patents with the “equivalent” US patents covering the same invention in the United States. Using the matched sample of USPTO and EPO patents, we compare the determinants of opposition and of reexamination. Our results indicate that valuable patents are more likely to be challenged in both jurisdictions. But the rate of opposition at the EPO is more than thirty times higher than the rate of reexamination at the USPTO.

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File URL: http://128.118.178.162/eps/io/papers/0303/0303009.pdf
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Bibliographic Info

Paper provided by EconWPA in its series Industrial Organization with number 0303009.

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Length: 46 pages
Date of creation: 19 Mar 2003
Date of revision:
Handle: RePEc:wpa:wuwpio:0303009

Note: 46 pages, Acrobat .pdf
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Web page: http://128.118.178.162

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  8. Harhoff, Dietmar & Reitzig, Markus, 2004. "Determinants of opposition against EPO patent grants--the case of biotechnology and pharmaceuticals," International Journal of Industrial Organization, Elsevier, vol. 22(4), pages 443-480, April.
  9. Richard C. Levin & Alvin K. Klevorick & Richard R. Nelson & Sidney G. Winter, 1988. "Appropriating the Returns from Industrial R&D," Cowles Foundation Discussion Papers 862, Cowles Foundation for Research in Economics, Yale University.
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