A survival analysis of the approval of US patent applications
AbstractWe model the length of time that it takes for a patent application to be granted by the US Patent and Trademark Office (USPTO), conditional on the patent actually being awarded eventually. Survival analysis is applied and both the nonparametric Kaplan-Meier and parametric accelerated failure time models are used to analyse the data. We find that the number of claims a patent makes, the number of citations a patent makes, the patent's technological category, and the type of applicant all have significant effects on the duration that a patent is under consideration. A log-normal survival model is the preferred parametric specification, and the results suggest that the hazard function is nonmonotonic over time.
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Bibliographic InfoArticle provided by Taylor & Francis Journals in its journal Applied Economics.
Volume (Year): 43 (2011)
Issue (Month): 11 ()
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Other versions of this item:
- Ying Xie & David E. Giles, 2007. "A Survival Analysis of the Approval of U.S. Patent Applications," Econometrics Working Papers 0707, Department of Economics, University of Victoria.
- C16 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Econometric and Statistical Methods; Specific Distributions
- C29 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Other
- C46 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods: Special Topics - - - Specific Distributions
- L10 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - General
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- Kennan, John, 1985. "The duration of contract strikes in U.S. manufacturing," Journal of Econometrics, Elsevier, vol. 28(1), pages 5-28, April.
- Gupeng, Zhang & Xiangdong, Chen, 2012. "The value of invention patents in China: Country origin and technology field differences," China Economic Review, Elsevier, vol. 23(2), pages 357-370.
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