| 来源类型 | Working Paper |
| 规范类型 | 报告 |
| DOI | 10.3386/w21443 |
| 来源ID | Working Paper 21443 |
| Patent Citations and the Size of the Inventive Step - Evidence from Hybrid Corn | |
| Petra Moser; Joerg Ohmstedt; Paul W. Rhode | |
| 发表日期 | 2015-08-10 |
| 出版年 | 2015 |
| 语种 | 英语 |
| 摘要 | Patents are the main source of data on innovation, but there are persistent concerns that patents may be a noisy and biased measure. An important challenge arises from unobservable variation in the size of the inventive step that is covered by a patent. The count of later patents that cite a patent as relevant prior art – so called forward citations – have become the standard measure to control for such variation. Citations may, however, also be a noisy and biased measure for the size of the inventive step. To address this issue, this paper examines field trial data for patented improvements in hybrid corn. Field trials report objective measures for improvements in hybrid corn, which we use to quantify the size of the inventive step. These data show a robust correlation between citations and improvements in yields, as the bottom line measure for improvements in hybrid corn. This correlation is robust to alternative measures for improvements in hybrid corn, and a broad range of other tests.We also investigate the process, by which patents generate citations. This analysis reveals that hybrids that serve as an input for genetically-related follow-on inventions are more likely to receive self-citations (by the same firm), which suggests that self-citations are a good predictor for follow-on invention. |
| 主题 | Development and Growth ; Innovation and R& ; D ; Environmental and Resource Economics ; Agriculture ; Environment |
| URL | https://www.nber.org/papers/w21443 |
| 来源智库 | National Bureau of Economic Research (United States) |
| 引用统计 | |
| 资源类型 | 智库出版物 |
| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/579118 |
| 推荐引用方式 GB/T 7714 | Petra Moser,Joerg Ohmstedt,Paul W. Rhode. Patent Citations and the Size of the Inventive Step - Evidence from Hybrid Corn. 2015. |
| 条目包含的文件 | 条目无相关文件。 | |||||
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