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Out of Sight: A Study of Uncited Patents

Author

Listed:
  • Gandal, Neil
  • Shur-Ofry, Michal
  • Crystal, Michael
  • Shilony, Royee
Abstract
Scientific understanding of innovation processes and of the patent system increasingly relies on big data analyses of patent citations. Much of that research focuses on highly cited patents. This study, conversely, offers the first systematic exploration of uncited patents—patents that receive no citations. Analyzing data on all US patents issued between 1976 and 2008, we focus on the ratio of uncited patents out of all patents granted each year. We track the changes in the percentage of uncited patents during that period, and across technological fields, controlling for patents’ age. We also investigate traits of uncited patents by examining the association between lack of citations and various factors including the number of inventors, number of technological subclasses, number of backward citations, and number of claims in the patent. We find a robust pattern whereby the percentage of uncited patents declined between 1976 and the mid 1990s, but has been significantly increasing since then. These findings are consistent across technological fields and hold after controlling for patent characteristics. We discuss these and additional findings, and propose possible explanations. We suggest that the trend of increase in uncited patents raises, and reinforces, concerns regarding patent quality and “patent explosion†. More broadly, our focus on “negative information†embedded in patent data opens up a new avenue for further research that can deepen our understanding of the patent system.

Suggested Citation

  • Gandal, Neil & Shur-Ofry, Michal & Crystal, Michael & Shilony, Royee, 2019. "Out of Sight: A Study of Uncited Patents," CEPR Discussion Papers 13982, C.E.P.R. Discussion Papers.
    • Handle: RePEc:cpr:ceprdp:13982
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    References listed on IDEAS

    as
    1. Thomas Y. Mathä & Stephen Millard & Tairi Rõõm & Ladislav Wintr & Robert Wyszyński, 2021. "Shocks and labour cost adjustment: evidence from a survey of European firms," Oxford Economic Papers, Oxford University Press, vol. 73(3), pages 1008-1033.
    2. Aditi Mehta & Marc Rysman & Tim Simcoe, 2010. "Identifying the age profile of patent citations: new estimates of knowledge diffusion," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 25(7), pages 1179-1204, November/.
    Full references (including those not matched with items on IDEAS)

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    More about this item

    Keywords

    Uncited patents; Patent citations; Networks; Big data; Negative knowledge; Innovation;
    All these keywords.

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