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"Stacking" or "Picking" Patents? The Inventors' Choice Between Quantity and Quality

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Author Info

  • Myriam Mariani
  • Marzia Romanelli

Abstract

This paper studies the determinants of the quantity and quality of inventors’ patents. It uses a sample of 793 inventors drawn from the PatVal-EU dataset and the information on EPO patents that they contributed to inventing during the period 1988-1998. It explores three aspects of the inventors’ productivity: 1) the number of EPO patents that they produce; 2) their average quality; 3) the quality of the most valuable patents. By jointly estimating the three equations we find that the inventors’ level of education, employment in a large firm and involvement in large-scale research projects positively affect quantity. Yet, apart from the size of the research project, none of these factors directly influences the expected quality of the innovations. They do, however, indirectly, as we find that the number of innovations explains the probability of producing a technological hit (the maximum value). Also, there are no decreasing returns in the innovation process at an individual level, as the number of innovations that an inventor produces is not correlated with their average quality.

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Bibliographic Info

Paper provided by Laboratory of Economics and Management (LEM), Sant'Anna School of Advanced Studies, Pisa, Italy in its series LEM Papers Series with number 2006/06.

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Date of creation: 14 Feb 2006
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Handle: RePEc:ssa:lemwps:2006/06

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Related research

Keywords: Productivity; Industrial inventors; Patent quality;

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References

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  8. Vopel, Katrin & Scherer, Frederic M. & Narin, Francis & Harhoff, Dietmar, 1997. "Citation Frequency and the Value of Patented Innovation," ZEW Discussion Papers 97-27, ZEW - Zentrum für Europäische Wirtschaftsforschung / Center for European Economic Research.
  9. Walter Y. Oi & Todd L. Idson, 1999. "Workers Are More Productive in Large Firms," American Economic Review, American Economic Association, vol. 89(2), pages 104-108, May.
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  13. repec:fth:harver:1473 is not listed on IDEAS
  14. Zucker, Lynne G & Darby, Michael R & Armstrong, Jeff, 1998. "Geographically Localized Knowledge: Spillovers or Markets?," Economic Inquiry, Western Economic Association International, vol. 36(1), pages 65-86, January.
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Citations

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Cited by:
  1. William Latham & Christian Le Bas & Dmitry Volodin, 2013. "Mobility, Productivity and Patent Value for Asian Prolific Inventors: China, Japan, Korea and Taiwan, 1975 – 2010," Working Papers 1306, Groupe d'Analyse et de Théorie Economique (GATE), Centre national de la recherche scientifique (CNRS), Université Lyon 2, Ecole Normale Supérieure.
  2. de Rassenfosse, Gaetan & van Pottelsberghe de la Potterie, Bruno, 2009. "A policy insight into the R&D-patent relationship," Research Policy, Elsevier, vol. 38(5), pages 779-792, June.
  3. Dietmar Harhoff, 2008. "Innovation, Entrepreneurship und Demographie," Perspektiven der Wirtschaftspolitik, Verein für Socialpolitik, vol. 9(3), pages 46-72, 08.
  4. Ejermo, Olof & Jung, Taehyun, 2012. "Demographic patterns and trends in patenting: Gender, age, and education of inventors," CIRCLE Electronic Working Papers 2012/5, Lund University, CIRCLE - Center for Innovation, Research and Competences in the Learning Economy, revised 03 Apr 2012.

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