The top 10 China's sub-provincial cities in granted invention patents in 2010 are Shenzhen (9,615), Hangzhou (3,238), Nanjing (2,487), Guangzhou (1,988), Wuhan (1,731), Chengdu (1,657), Xi'an (1,651), Harbin (1,326), Jinan (1,258) and Ningbo (1,209). 2013-07-17