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Date:2022-07-07

Date of Publication:2021-01-01

Journal:Journal of the China Society for Scientific and Technical Information

Institution:技术研究开发院（科技合作与成果转化中心）

Volume:40

Issue:3

Page Number:267-277

ISSN:1000-0135

Key Words:"patent impact; patent evaluation; indirect citation; citation network; all-generation citation"

CN:11-2257/G3

Abstract:Direct patent citations are currently used to measure the impact of patents.However,the practice of evaluating patents'impacts based on multiple generations of citations is gradually emerging.It is not sufficient to evaluate patents using direct patent citations,and it is thus important to take indirect patent citations into consideration.In this study,we examine the patents of Sydney Brunner,who won the Nobel Prize in Physiology and Medicine in the USPTO.Based on the cumulative impact method,we develop a cumulative impact index to determine the deep research impact diffusion and citation networks of patents.The results show that the cumulative impact index is more effective than direct patent citations in evaluating patent impact and can reveal"hidden"high-impact patents in large-scale patent networks.Patent citations and the number of cited patents of each generation are approximately normally distributed."Key patents"in the citation networks contribute significantly to the impact of the target patent.The higher the number of direct patent citations,the greater the potential for patents to be indirectly cited.Patents with less generations of citations and more direct patent citations are potentially high-impact patents.

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