Please use this identifier to cite or link to this item: http://hdl.handle.net/10419/24249
Authors: 
Vopel, Katrin
Scherer, Frederic M.
Narin, Francis
Harhoff, Dietmar
Year of Publication: 
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

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