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Claim Length as a Value Predictor of a Patent

Yoshimi Okada, Yusuke Naito and Sadao Nagaoka

No 16-04, IIR Working Paper from Institute of Innovation Research, Hitotsubashi University

Abstract: The claim of a patent defines the scope of patent right and provides crucial information on patent value. However, most empirical research uses only the number of claims as an indicator of patent value. We show that the breadth of a claim of Japanese patents, measured by the inverse of claim length, has significant explanatory power for patent value measured by applicant forward citations. Indeed, the explanatory power of claim breadth is comparable with that of the number of claims. The predictive power of claim breadth is stable for all quantiles in the discrete technology area, while it is far more significant for top-ranked patents in the complex technology area.

Keywords: Claim length; patent value; quantile regression; discrete technology; complex technology; applicant forward citation (search for similar items in EconPapers)
JEL-codes: O34 (search for similar items in EconPapers)
Pages: 9 p.
Date: 2016-05
New Economics Papers: this item is included in nep-ino, nep-ipr and nep-pr~
Note: Revised in May 2016
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