《Table 2 T value determination statistics excerpt》

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

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This paper employs exhaustive method to determine the validity of T.Combined with the research and common sense of scholars，this paper sets the range of T from 1 to 50.Under the condition of double-proportion 60%-60%，the obsolescence of the sample patent was calculated when the value of T is taken as 1，2...50 respectively.Table 2 shows the distribution and obsolescence rates of selected patent categories under different T，the observation time is from January1995 to December 2015，and the total number of sample patents is 4541.The first type of patents in the table refers to the patent that hasn’t been cited for the first time in the period of（T+DE）months from the approval date；the second type of patents refer to the number of obsolescence patents during the observation time；the third type of patents refers to the number of patents that are not expired during the observation time；the number of obsolescence P1 patent refers to the number of invalid patent citation within the effective life span occupying more than P1（60%）of the total citation number during observation time；the obsolescence-P2 proportion refers to the proportion of the number of invalid-P1 patents and the number of nonobsolescence patents in the total number of invalid patents and non-obsolescence patents.