Modelling the duration of patent examination at the European Patent Office
We analyze the duration of patent examination at the European Patent Office (EPO). Our data contain variables that are correlates of the applicants’ and examiners’ assessments of a patent’s economic and technical relevance as well as ex post-application citation measures which indicate the impact of the patent application on the state of the art. We present descriptive statistics for 30 major technology fields. In our multivariate analysis we estimate competing risk specifications in order to characterize differences in the processes leading to either a withdrawal of the application by the applicant, a refusal of the patent grant or an actual patent grant by the European Patent Office. Measuring a patent’s importance relying on the number of citations by subsequent patents we find that more important patents are approved faster by the EPO than less important patents but that applicants are more hesitant to withdraw these potentially valuable applications.
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- Manuel Trajtenberg & Rebecca Henderson & Adam Jaffe, 1997. "University Versus Corporate Patents: A Window On The Basicness Of Invention," Economics of Innovation and New Technology, Taylor & Francis Journals, vol. 5(1), pages 19-50.
- P. Regibeau & K. Rockett, 2003.
"Are More Important Patents Approved More Slowly and Should They Be?,"
Economics Discussion Papers
556, University of Essex, Department of Economics.
- Régibeau, Pierre & Rockett, Katharine, 2007. "Are More Important Patents Approved More Slowly and Should They Be?," CEPR Discussion Papers 6178, C.E.P.R. Discussion Papers.
- David Popp & Ted Juhl & Daniel K.N. Johnson, 2003. "Time in Purgatory: Determinants of the Grant Lag for U.S. Patent Applications," NBER Working Papers 9518, National Bureau of Economic Research, Inc.
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