Incidence and Growth of Patent Thickets - The Impact of Technological Opportunities and Complexity
AbstractWe investigate incidence and evolution of patent thickets. Our empirical analysis is based on a theoretical model of patenting in complex and discrete technologies. The model captures how competition for patent portfolios and complementarity of patents affect patenting incentives. We show that lower technological opportunities increase patenting incentives in complex technologies while they decrease incentives in discrete technologies. Also, more competitors increase patenting incentives in complex technologies and reduce them in discrete technologies. To test these predictions a new measure of the density of patent thickets is introduced. European patent citations are used to construct measures of fragmentation and technological opportunity. Our empirical analysis is based on a panel capturing patenting behavior of 2074 firms in 30 technology areas over 15 years. GMM estimation results confirm the predictions of our theoretical model. The results show that patent thickets exist in 9 out of 30 technology areas. We find that decreased technological opportunities are a surprisingly strong driver of patent thicket growth.
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Bibliographic InfoPaper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 6900.
Date of creation: Jul 2008
Date of revision:
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- Graevenitz, Georg von & Wagner, Stefan & Harhoff, Dietmar, 2011. "Incidence and Growth of Patent Thickets - The Impact of Technological Opportunities and Complexity," Discussion Paper Series of SFB/TR 15 Governance and the Efficiency of Economic Systems 356, Free University of Berlin, Humboldt University of Berlin, University of Bonn, University of Mannheim, University of Munich.
- L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets
- L20 - Industrial Organization - - Firm Objectives, Organization, and Behavior - - - General
- O34 - Economic Development, Technological Change, and Growth - - Technological Change; Research and Development; Intellectual Property Rights - - - Intellectual Property Rights
This paper has been announced in the following NEP Reports:
- NEP-ALL-2008-07-14 (All new papers)
- NEP-INO-2008-07-14 (Innovation)
- NEP-IPR-2008-07-14 (Intellectual Property Rights)
- NEP-KNM-2008-07-14 (Knowledge Management & Knowledge Economy)
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