| Budget Amount *help |
¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
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| Research Abstract |
In a patent renewal model by Pakes and Schankerman (1984), a series of expected returns assumes the depreciated value on the basis of an initial return. Then there are two key issues: how the depreciated value is initially distributed and how it changes over patent age. Although we cannot observe them, information about the distribution of the renewal term is useful of the patent renewal model’s setting. Using the data for individual Japanese patents, I found that the rate of expiration at patent age varies over patent age. Furthermore, a nonparametric estimation fits on a parametric estimation by Weibull distribution.
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