针对国内专利维持时间短、市场激励属性难以充分发挥作用的现状，以燃料电池领域国内发明专利和日本在华发明专利为实验数据集，利用Cox生存模型对专利维持时间影响因素进行分析。研究表明：权利要求项数和同族专利的增加以及IPC分类数量的减少可以降低国内专利的生存风险，发明人数量和同族专利的增加能够降低日本在华专利的生存风险。研究发现，宏观分析与领域分析获得的影响因素具有差异性，与宏观分析相比，对特定技术领域影响因素分析的思路和方法，能更为深入、客观地揭示问题的实质。
Chinese patents have short holding time and it is difficult to fully reflect the market incentives attribute. Based on the experimental data set about fuel cell field of China's invention patents and Japan's invention patents in China, this paper analyzes the influence factors of patent holding time with Cox survival model. The result shows that the increase of claim number and kin patents with the reduction of the IPC classification number can reduce the risk of China's patent survival, the increase of the inventor and kin patent will reduce the risk of Japan's patent in China. The study finds that influence factors from macroscopic analysis are different with field analysis. Compared with the macroscopic analysis, the research ideas and methods on specific technology area can reveal the question more detailed and objectively.
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