Abstract
Based on the maintenance and examination information of granted 3838 patents in 1994 by SIPO, this paper draws some conclusions after concrete analysis. Firstly, the maintenance time is negatively related to the examination time. Secondly, the maintenance times of most patents are 1–3 years and the examination times of most patents are 2–5 years. Thirdly, when the examination time of a patent is between 2 and 5 years, the maintenance time of this patent will be longer, especially in 4 years, compared to other examination time. Then, this paper researches the reasons of above conclusions from the point of patent protection period, the financing policy, the market conditions and the patent censor system. In the end, this paper makes suggestions how to extend maintenance time of patent.
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