2012 Fiscal Year Final Research Report
The Value of Patents Revisited
| Project/Area Number |
22730216
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Applied economics
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| Research Institution | Tezukayama University |
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Principal Investigator |
KANI Masayo 帝塚山大学, 経済学部, 准教授 (20509187)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 特許価値 / 特許更新モデル / 陳腐化率 |
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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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