| 来源类型 | Discussion paper |
| 规范类型 | 论文 |
| 来源ID | DP13982 |
| DP13982 Out of Sight: A Study of Uncited Patents | |
| Neil Gandal; Michal Shur-Ofry; Michael Crystal; Royee Shilony | |
| 发表日期 | 2019-09-03 |
| 出版年 | 2019 |
| 语种 | 英语 |
| 摘要 | 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. |
| 主题 | Industrial Organization |
| 关键词 | Uncited patents Patent citations Networks Big data Negative knowledge Innovation |
| URL | https://cepr.org/publications/dp13982 |
| 来源智库 | Centre for Economic Policy Research (United Kingdom) |
| 资源类型 | 智库出版物 |
| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/542863 |
| 推荐引用方式 GB/T 7714 | Neil Gandal,Michal Shur-Ofry,Michael Crystal,et al. DP13982 Out of Sight: A Study of Uncited Patents. 2019. |
| 条目包含的文件 | 条目无相关文件。 | |||||
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