Incidence and Growth of Patent Thickets - The Impact of Technological Opportunities and Complexity
We 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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Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
- Adam B. Jaffe & Josh Lerner, 2006.
"Innovation and its Discontents,"
NBER Chapters,in: Innovation Policy and the Economy, Volume 6, pages 27-66
National Bureau of Economic Research, Inc.
- Jaffe Adam B. & Lerner Josh, 2006. "Innovation and Its Discontents," Capitalism and Society, De Gruyter, vol. 1(3), pages 1-36, December.
- Mark A. Lemley & Carl Shapiro, 2005. "Probabilistic Patents," Journal of Economic Perspectives, American Economic Association, vol. 19(2), pages 75-98, Spring.
- Lemley, Mark A. & Shapiro, Carl, 2004. "Probabilistic Patents," Competition Policy Center, Working Paper Series qt9xf1488p, Competition Policy Center, Institute for Business and Economic Research, UC Berkeley.
- Kortum, Samuel & Lerner, Josh, 1998. "Stronger protection or technological revolution: what is behind the recent surge in patenting?," Carnegie-Rochester Conference Series on Public Policy, Elsevier, vol. 48(1), pages 247-304, June.
- Samuel Kortum & Josh Lerner, 1997. "Stronger Protection or Technological Revolution: What is Behind the Recent Surge in Patenting?," NBER Working Papers 6204, National Bureau of Economic Research, Inc.
- Nancy Gallini & Suzanne Scotchmer, 2002. "Intellectual Property: When Is It the Best Incentive System?," NBER Chapters,in: Innovation Policy and the Economy, Volume 2, pages 51-78 National Bureau of Economic Research, Inc.
- Gallini, Nancy & Scotchmer, Suzanne, 2001. "Intellectual Property: When Is It the Best Incentive System?," Department of Economics, Working Paper Series qt9wx2c2hz, Department of Economics, Institute for Business and Economic Research, UC Berkeley.
- Nancy Gallini & Suzanne Scotchmer, 2003. "Intellectual Property: When is it the Best Incentive System?," Levine's Working Paper Archive 618897000000000532, David K. Levine.
- Nancy Gallini & Suzanne Scotchmer, 2002. "Intellectual Property: When Is It the Best Incentive System?," Law and Economics 0201001, EconWPA.
- Nancy Gallini and Suzanne Scotchmer., 2001. "Intellectual Property: When Is It the Best Incentive System?," Economics Working Papers E01-303, University of California at Berkeley.
- Arellano, Manuel & Bover, Olympia, 1995. "Another look at the instrumental variable estimation of error-components models," Journal of Econometrics, Elsevier, vol. 68(1), pages 29-51, July.
- M Arellano & O Bover, 1990. "Another Look at the Instrumental Variable Estimation of Error-Components Models," CEP Discussion Papers dp0007, Centre for Economic Performance, LSE.
- Rabah Amir, 2005. "Supermodularity and Complementarity in Economics: An Elementary Survey," Southern Economic Journal, Southern Economic Association, vol. 71(3), pages 636-660, January.
- AMIR, Rabah, "undated". "Supermodularity and complementarity in economics: an elementary survey," CORE Discussion Papers RP 1823, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
- AMIR, Rabah, 2003. "Supermodularity and complementarity in economics: an elementary survey," CORE Discussion Papers 2003104, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
- Bronwyn H. Hall, 2005. "Exploring the Patent Explosion," The Journal of Technology Transfer, Springer, vol. 30(2_2), pages 35-48, 01.
- Bronwyn H. Hall, 2004. "Exploring the Patent Explosion," NBER Working Papers 10605, National Bureau of Economic Research, Inc.
- Bronwyn Hall, 2004. "Exploring the patent explosion," Working Papers wp291, Centre for Business Research, University of Cambridge.
- Noel, Michael D. & Schankerman, Mark, 2006. "Strategic Patenting and Software Innovation," CEPR Discussion Papers 5701, C.E.P.R. Discussion Papers.
- Javier Alvarez & Manuel Arellano, 2003. "The Time Series and Cross-Section Asymptotics of Dynamic Panel Data Estimators," Econometrica, Econometric Society, vol. 71(4), pages 1121-1159, 07.
- Alvarez, J. & Arellano, M., 1998. "The Time Series and Cross-Section Asymptotics of Dynamic Panel Data Estimators," Papers 9808, Centro de Estudios Monetarios Y Financieros-.
- Blundell, Richard & Bond, Stephen, 1998. "Initial conditions and moment restrictions in dynamic panel data models," Journal of Econometrics, Elsevier, vol. 87(1), pages 115-143, August.
- R Blundell & Steven Bond, "undated". "Initial conditions and moment restrictions in dynamic panel data model," Economics Papers W14&104., Economics Group, Nuffield College, University of Oxford.
- Richard Blundell & Stephen Bond, 1995. "Initial conditions and moment restrictions in dynamic panel data models," IFS Working Papers W95/17, Institute for Fiscal Studies.
- Blundell, R. & Bond, S., 1995. "Initial Conditions and Moment Restrictions in Dynamic Panel Data Models," Economics Papers 104, Economics Group, Nuffield College, University of Oxford.
- James Bessen, 2004. "Patent Thickets: Strategic Patenting of Complex Technologies," Working Papers 0401, Research on Innovation.
- Michael Noel & Mark Schankerman, 2006. "Strategic Patenting and Software Innovation," CEP Discussion Papers dp0740, Centre for Economic Performance, LSE.
- Kazuhiko Hayakawa, 2006. "The Asymptotic Properties of the System GMM Estimator in Dynamic Panel Data Models When Both N and T are Large," Hi-Stat Discussion Paper Series d05-129, Institute of Economic Research, Hitotsubashi University.
- 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.
- Xavier Vives, 2001. "Oligopoly Pricing: Old Ideas and New Tools," MIT Press Books, The MIT Press, edition 1, volume 1, number 026272040x, July.
- Glenn C. Loury, 1979. "Market Structure and Innovation," The Quarterly Journal of Economics, Oxford University Press, vol. 93(3), pages 395-410.
- Glenn C. Loury, 1976. "Market Structure and Innovation," Discussion Papers 256, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
- Michael Noel & Mark Schankerman, 2006. "Strategic Patenting and Software Innovation," STICERD - Economics of Industry Papers 43, Suntory and Toyota International Centres for Economics and Related Disciplines, LSE.
- Windmeijer, Frank, 2005. "A finite sample correction for the variance of linear efficient two-step GMM estimators," Journal of Econometrics, Elsevier, vol. 126(1), pages 25-51, May.
- Stephen Bond, 2002. "Dynamic panel data models: a guide to microdata methods and practice," CeMMAP working papers CWP09/02, Centre for Microdata Methods and Practice, Institute for Fiscal Studies. Full references (including those not matched with items on IDEAS)
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