Manifesting Relevant Patent Citations and Relevant Un-cited Patents Using Bibliographic Coupling and Co-Citation
Date Issued
2010
Date
2010
Author(s)
Sung, Yi-Shan
Abstract
Patent citations are extensively used for measuring the importance of patents, regarded as the knowledge flow among countries and technology fields for analysis, and applied to mapping technological trajectories for studying the evolution of the technology. However, patent citation analysis is subject to some uncertainties. Many patents are cited only with slightly relevant because they are only related to one very specific technical aspect. Moreover, many patents which should have been cited are missed. This paper aims to identify the relevant citations and the relevant un-cited patents in order to present the more precise view in the citation relationships. Both of BC and CC methods are utilized to identify the relevant citations and the relevant un-cited patents. Besides, the occurrence of relevant citations and relevant un-cited patents are related to the citation time lag (CTL), which is the time necessary for the cited patent being cited by the citing patent. The results show that citations with shorter CTL are more possible to be relevant, and this phenomenon is more obvious by BC. It reveals that it takes time for any two patents to establish their CC relations. Some relevant information cannot be dug out by CC, and therefore BC is the better approach of the identification.
Subjects
patent citation network
bibliographic coupling
co-citation, relevant citation
relevant un-cited patent
citation time lag
cited count
Type
thesis
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