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Making the patent scope consistent with the invention: Evidence from Japan

Author

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  • Yoshimi Okada
  • Yusuke Naito
  • Sadao Nagaoka
Abstract
It is a crucial function of patent examination to make the patent scope consistent with the contribution of the invention to the state of the art. We assess this function using newly developed data on the scope of Japanese patent applications and grants. We find that the scope was narrowed in two thirds of the grants, both the incidence and the extent of narrowing increased when the applicant chose broad initial scope and decreased when the quality of the applicant's disclosure of prior art was high, and that important applications experienced narrowing more frequently, as one expects from rational examination.

Suggested Citation

  • Yoshimi Okada & Yusuke Naito & Sadao Nagaoka, 2018. "Making the patent scope consistent with the invention: Evidence from Japan," Journal of Economics & Management Strategy, Wiley Blackwell, vol. 27(3), pages 607-625, September.
    • Handle: RePEc:bla:jemstr:v:27:y:2018:i:3:p:607-625
    DOI: 10.1111/jems.12266
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    References listed on IDEAS

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    1. Masami Imai & Michiru Sawada, 2022. "Does a Financial Crisis Impair Corporate Innovation?," Wesleyan Economics Working Papers 2022-002, Wesleyan University, Department of Economics.
    2. Beladi, Hamid & Hou, Qingsong & Hu, May, 2022. "The party school education and corporate innovation: Evidence from SOEs in China," Journal of Corporate Finance, Elsevier, vol. 72(C).
    3. Higham, Kyle & Contisciani, Martina & De Bacco, Caterina, 2022. "Multilayer patent citation networks: A comprehensive analytical framework for studying explicit technological relationships," Technological Forecasting and Social Change, Elsevier, vol. 179(C).
    4. Appio, Francesco Paolo & Baglieri, Daniela & Cesaroni, Fabrizio & Spicuzza, Lucia & Donato, Alessia, 2022. "Patent design strategies: Empirical evidence from European patents," Technological Forecasting and Social Change, Elsevier, vol. 181(C).
    5. Haoyang Song & Jianhua Hou & Yang Zhang, 2022. "Patent protection: does it promote or inhibit the patented technological knowledge diffusion?," Scientometrics, Springer;Akadémiai Kiadó, vol. 127(5), pages 2351-2379, May.

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