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| Research on Evolution of Patent Cluster Network Based on Key Nodes and Critical Path |
| Pan Weiwei1,Jian Lirong1,Liu Tao2 |
| (1.College of Economics and Management,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;2.The 55th Research Institute of Electronics Technology Group Corporation,Nanjing 210016,China) |
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Abstract Patents are important sources of information for studying technological evolution and industrial development since they are crucial carriers of technology and knowledge.Currently,there is lacking comparative analysis and technical knowledge mining for key nodes in the patent cluster network and nodes in the critical path.This paper constructs a patent cluster network evolution model based on key nodes and critical path,thus comprehensively analyzes the characteristics of technology evolution from both aspects of patent cluster network core patents and critical path core technologies.By searching the Derwent Innovation Index,relevant patents of silicon-carbide Schottky barrier diode (SiC-SBD) were obtained as the empirical data source from 1986 to 2017.Results show that through the analysis of changes in the number of patent applications and the number of patentees,the SiC-SBD patent cluster network has experienced germination,growth,maturity,and recession.The patents of SiC-SBD in germination phase mainly involve in basic technology research,while patents in the growth phase are device structure research.At present,the main research direction is how to improve device structure and diode performance.In recent years,the annual growth of SiC-SBD patents decreases,and the speed of technological development is degenerative,however,the value of patents is more reflected in its commercial value.The key nodes of SiC-SBD patent cluster network have a high degree of coincidence with the nodes in the critical path,which indicates that the identification of the core patents from patent cluster networks can be obtained through multi-perspective analysis.It is helpful to present the technology evolution in a more comprehensive way and provide a reference for decision-makers to identify core patents and predict the development of technology,by analyzing the evolution of patent cluster network through key nodes and critical paths.
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Received: 01 November 2019
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