Indirect Patent Citations
Patent citations are extensively used as a measure of patent quality. However, counting citations does not account for the fast that citations corne from patents of different qualities, and that some citations are of a higher quality than other citations. We propose and develop a citation index which takes into account the cumulative quality of the citing patents. We apply this index to the 2,139,314 utility patents granted in the U.S. between 1975 and 1999. We study the properties of this index by year and by technological category, and analyse the links between patents.
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References listed on IDEAS
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- Manuel Trajtenberg, 1990. "A Penny for Your Quotes: Patent Citations and the Value of Innovations," RAND Journal of Economics, The RAND Corporation, vol. 21(1), pages 172-187, Spring.
- Ignacio Palacios-Huerta & Oscar Volij, 2004.
"The Measurement of Intellectual Influence,"
Econometric Society, vol. 72(3), pages 963-977, May.
- Ignacio Palacios-Huerta & Oscar Volij, 2002. "The Measurement of Intellectual Influence," Economic theory and game theory 015, Oscar Volij.
- Volij, Oscar & Palacios-Huerta, Ignacio, 2004. "The Measurment of Intellectual Influence," Staff General Research Papers Archive 10797, Iowa State University, Department of Economics.
- Hall, B. & Jaffe, A. & Trajtenberg, M., 2001. "The NBER Patent Citations Data File: Lessons, Insights and Methodological Tools," Papers 2001-29, Tel Aviv.
- Bronwyn H. Hall & Adam B. Jaffe & Manuel Trajtenberg, 2001. "The NBER Patent Citation Data File: Lessons, Insights and Methodological Tools," NBER Working Papers 8498, National Bureau of Economic Research, Inc.
- Hall, Bronwyn H & Jaffe, Adam B & Trajtenberg, Manuel, 2001. "The NBER Patent Citations Data File: Lessons, Insights and Methodological Tools," CEPR Discussion Papers 3094, C.E.P.R. Discussion Papers.
- Bronwyn H. Hall & Manuel Trajtenberg, 2004. "Uncovering GPTS with Patent Data," NBER Working Papers 10901, National Bureau of Economic Research, Inc.
- Terza, Joseph V., 1998. "Estimating count data models with endogenous switching: Sample selection and endogenous treatment effects," Journal of Econometrics, Elsevier, vol. 84(1), pages 129-154, May.
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- Ignacio Palacios-Huerta & Oscar Volij, 2002. "The Measure of Intellectual Influence," Working Papers 2002-13, Brown University, Department of Economics.
- Isabel Busom, 2000. "An Empirical Evaluation of The Effects of R&D Subsidies," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 9(2), pages 111-148.
- Minoru Kitahara & Toshihiro Matsumura, 2006. "Realized Cost-Based Subsidies For Strategic R&D Investments With "Ex Ante" And "Ex Post" Asymmetries," The Japanese Economic Review, Japanese Economic Association, vol. 57(3), pages 438-448.
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- J. Peter Neary & James A. Mirrlees & Jean Tirole, 2003. "Evaluating Economics Research in Europe: An Introduction," Journal of the European Economic Association, MIT Press, vol. 1(6), pages 1239-1249, December.
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- C. Gay & C. Le Bas, 2005. "Uses without too many abuses of patent citations or the simple economics of patent citations as a measure of value and flows of knowledge," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 14(5), pages 333-338.
- Petrakis, Emmanuel & Poyago-Theotoky, Joanna, 2002. "R&D Subsidies versus R&D Cooperation in a Duopoly with Spillovers and Pollution," Australian Economic Papers, Wiley Blackwell, vol. 41(1), pages 37-52, March.
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- Stephen Martin & John T. Scott, 1999. "The Nature of Innovation Market Failure and the Design of Public Support for Private Innovation," CIE Discussion Papers 1999-02, University of Copenhagen. Department of Economics. Centre for Industrial Economics.
- Karolina Ekholm & Johan Torstensson, 1997. "High-Technology Subsidies in General Equilibrium: A Sector-Specific Approach," Canadian Journal of Economics, Canadian Economics Association, vol. 30(4), pages 1184-1203, November.
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- Emmanuel Duguet & Megan MacGarvie, 2005. "How well do patent citations measure flows of technology? Evidence from French innovation surveys," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 14(5), pages 375-393.
- DUGUET Emmanuel & MacGARVIE Megan, 2004. "How Well Do Patent Citations Measure Flows of Technology? Evidence from French Innovation Surveys," Development and Comp Systems 0411018, EconWPA.
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- Jean O. Lanjouw & Mark Schankerman, 2004. "Patent Quality and Research Productivity: Measuring Innovation with Multiple Indicators," Economic Journal, Royal Economic Society, vol. 114(495), pages 441-465, April.
- Hirschey, Mark & Richardson, Vernon J & Scholz, Susan, 2001. "Value Relevance of Nonfinancial Information: The Case of Patent Data," Review of Quantitative Finance and Accounting, Springer, vol. 17(3), pages 223-235, November. Full references (including those not matched with items on IDEAS)