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Title:Citation Frequency and the Value of Patented Innovation PDF Logo
Authors:Vopel, Katrin
Scherer, Frederic M.
Narin, Francis
Harhoff, Dietmar
Issue Date:1997
Series/Report no.:ZEW Discussion Papers 97-27
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.
Subjects:Innovation
Patent
Citation
Count data model
JEL:O34
O47
Document Type:Working Paper
Appears in Collections:Publikationen von Forscherinnen und Forschern des ZEW
ZEW Discussion Papers

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