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| Contrastive Analysis on Expired Patents' National Differences and Bibliometric Characteristics |
| Li Rui, Zhang Handong |
| Institute for Disaster Management and Reconstruction, Sichuan University, Chengdu 610207 |
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Abstract Expired patents are high-value patents with technology that is nearly unsurpassable and whose market share is difficult to plunder. Among the patents authorized by the National Intellectual Property Administration of China, the expiration rate of invention patents from patentees in Japan, the United States, Germany, France, and other countries is much higher than that of invention patents from Chinese patentees. In this paper, a nonparametric test method is used to analyze the national differences of expired patents' bibliometric characteristics. We then further track and compare invention patents in a specific field at three time windows (20 years ago, 10 years ago, and 5 years ago). The following results are shown. First, there is no positive correlation between expiration rate and citation level. The overall citation level of Chinese patents is higher, but the expiration rate is lower. Second, there is a significant positive correlation between expiration rate and citations. Third, the functional richness and universality of patents are important factors that affect their expiration rate. Fourth, the number of citing non-patent documents does not objectively reflect the degree of scientific association and has no influence on the patents' expiration rate. Finally, the size of the patent family is an important factor that affects whether a patent can be maintained until its expiration.
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Received: 29 April 2020
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