A Comparative Study of Factors Influencing the Survival Time of Invention Patents in Chinese Universities

Abstract

Based on the fact that the granted amount of patents in Chinese universities have increased significantly, we took the invention patents applied by universities in Sichuan Province from 2001 to 2015 as a sample and adopted Kaplan-Meier survival analysis and Cox proportional hazards model. We found significant differences in the survival time of invention patents in the three types of universities Based on this, we conducted an empirical study and comparative analysis on the factors influencing the survival time of the three types of universities. It was found that the number of citations and the number of patent families have different effects on the survival time of invention patents in the three types of universities; the examination time and the number of inventors have negative effects on the survival time of invention patents in the three types of universities; the number of claims, the number of IPCs and the number of forward citations have positive effects on the survival time of invention patents in the three types of universities. This paper can provide some reference for universities to cultivate high-value patents.

Keywords

• patents and inventions
• technology transfer
• survival analysis
• influencing factor