Invention patent (38 15) utility model (4) design (537)
According to IPC, the statistics are as follows (number of patents in brackets):
03( 10) Travel expenses of personnel not included in other categories
08( 1) Tools and metal appliances
10(4) Clocks and other measuring instruments
13(54) power generation, distribution and transmission design
14(465) Recording, communication or information reproduction
16 photography, film and optics
17( 1) musical instrument
99( 1) Miscellaneous
(6) the needs of human life
B(40) homework; transport
C( 19) chemistry; metallurgy
D( 1) textile; make paper
(3) Fixed buildings
F(7) mechanical engineering; Lighting; hot
G(792) physics
H(295 1) electricity
Data source: Shanghai Intellectual Property (patent information) public service platform retrieval system.