How to measure patent thickets--A novel approach
This paper provides a direct measure of the density of patent thickets based on patent citations. We discuss the algorithm that generates the measure and present descriptive results validating it. Moreover, we identify technology areas particularly affected by patent thickets.
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- Carl Shapiro, 2001.
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NBER Chapters,in: Innovation Policy and the Economy, Volume 1, pages 119-150
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- Carl Shapiro, 2004. "Navigating the Patent Thicket: Cross Licenses, Patent Pools and Standard Setting," Levine's Working Paper Archive 122247000000000539, David K. Levine.
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- Harhoff, Dietmar & von Graevenitz, Georg & Wagner, Stefan, 2008. "Incidence and Growth of Patent Thickets - The Impact of Technological Opportunities and Complexity," CEPR Discussion Papers 6900, C.E.P.R. Discussion Papers.
- 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.
- Wesley M. Cohen & Richard R. Nelson & John P. Walsh, 2000. "Protecting Their Intellectual Assets: Appropriability Conditions and Why U.S. Manufacturing Firms Patent (or Not)," NBER Working Papers 7552, National Bureau of Economic Research, Inc.
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- Adam B. Jaffe, 1999. "The U.S. Patent System in Transition: Policy Innovation and the Innovation Process," NBER Working Papers 7280, National Bureau of Economic Research, Inc.
- Hall, Bronwyn H & Ziedonis, Rosemarie Ham, 2001. "The Patent Paradox Revisited: An Empirical Study of Patenting in the U.S. Semiconductor Industry, 1979-1995," RAND Journal of Economics, The RAND Corporation, vol. 32(1), pages 101-128, Spring. Full references (including those not matched with items on IDEAS)
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