The market value of blocking patent citations


Czarnitzki, Dirk ; Hussinger, Katrin ; Leten, Bart


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    URL:: http://ub-madoc.bib.uni-mannheim.de/3166
    URN: urn:nbn:de:bsz:180-madoc-31661
    Document Type: Working paper
    Year of publication: 2011
    Publication language: English
    Institution: Sonstige Einrichtungen > Zentrum für Europ. Wirtschaftsforschung (ZEW)
    MADOC publication series: Veröffentlichungen des ZEW (Zentrum für Europäische Wirtschaftsforschung) > ZEW Discussion Papers
    Subject: 330 Economics
    Classification: JEL: O38 O34 O31
    Subject headings (SWD): Japan , USA , Europäische Union , Patent , Marktwert , Veröffentlichung , Analyse , Innovation
    Keywords (English): Market value , patents , citations , patent value
    Abstract: There is a growing literature that aims at assessing the private value of knowledge assets and patents. It has been shown that patents and their quality as measured by citations received by future patents contribute significantly to the market value of firms beyond their R&D stocks. This paper goes one step further and distinguishes between different types of forward citations patents can receive at the European Patent Office. While a patent can be cited as non-infringing state of the art, it can also be cited because it threatens the novelty of patent applications (“blocking citations”). Empirical results from a market value model for a sample of large, R&D-intensive U.S., European and Japanese firms show that patents frequently cited as blocking references have a higher economic value for their owners than patents cited for nonblocking reasons. This finding adds to the patent value literature by showing that different types of patent citations carry different information on the economic value of patents. Th result further suggests that the total number of forward citations can be an imprecise measure of patent value.
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