《Table 1 Patent 5923544 citation sequence distribution statistics table》

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《An empirical research on the field of wireless charging based on patent life length》

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Based on the relationship between patents in terms of citation，starting from the patents authorization，citation time，the citation frequency within that month and total citing frequency of each patent is calculated by month.The specific calculation method is shown in Table 1，which lists the timing distribution of citation in the patent No.5923544t（document‘Noncontact power transmitting apparatus’）in detail.The patent number‘5923544’is a patent granted to Japan’s TDK Corporation in July 1999，therefore there was no citation before July 1999.It can be seen from the table that up to December 2015，the patent received a total of 84 citations.It was first cited in the 7 th month after obtaining authorization，then second citation occurred in the 11 th month，and it was cited again in the 14 th month.Afterwards，the patent received attention continuously.Up to January 2013，the cumulative number of citations was 42 and the cumulative citation proportion reached 50%for the first time.The longest consecutive continuous period of zero citation was 17months.The span of the patent from the first citation to the statistical deadline was 165 months.