Date of authorization: June 4, 2002
◆ Li Desheng, Xia and Tao: gearless electromagnetic clock, national utility model patent application, patent number: ZL03260853.5, authorized date: 2004.
September 15
Li Desheng, Xia: A miniature relay and its manufacturing method, national invention patent application, application number: 03 146 1 14. X. Date of application:
July 23(rd), 2003
◆ Li Desheng, Zhang Yufeng and Li Haoqun: A miniature electromagnetic relay and its preparation method, national invention patent application, application number: 2004 10006678, application date: 19, March 2004.
◆ Li Desheng: A liquid cooling device for computer power supply, national invention patent application, application number: 2004 100062555, application date: April 23, 2004.