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Citation Frequency and the Value of Patented Innovation

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  • Vopel, Katrin
  • Scherer, Frederic M.
  • Narin, Francis
  • Harhoff, Dietmar

Abstract

Through a survey, economic value estimates were obtained on 962 inventions made in the United States and Germany and on which German patent renewal fees were paid to full-term expiration in 1995. A search of subsequent U.S. and German patents yielded a count of citations to those patents. Patents renewed to full term were significantly more valuable than patents allowed to expire before their full term. The higher an invention?s economic value estimate was, the more the relevant patent was subsequently cited. --

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Bibliographic Info

Paper provided by ZEW - Zentrum für Europäische Wirtschaftsforschung / Center for European Economic Research in its series ZEW Discussion Papers with number 97-27.

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Date of creation: 1997
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Handle: RePEc:zbw:zewdip:5130

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Keywords: Innovation; Patent; Citation; Count data model;

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  1. Jean O. Lanjouw & Ariel Pakes & Jonathan Putnam, 1996. "How to Count Patents and Value Intellectual Property: Uses of Patent Renewal and Application Data," NBER Working Papers 5741, National Bureau of Economic Research, Inc.
  2. Scherer, Frederic M. & Harhoff, Dietmar & Vopel, Katrin, 1997. "Exploring the Tail of Patented Invention Value Distributions," ZEW Discussion Papers, ZEW - Zentrum für Europäische Wirtschaftsforschung / Center for European Economic Research 97-30, ZEW - Zentrum für Europäische Wirtschaftsforschung / Center for European Economic Research.
  3. 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.
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