Derwent Innovations Index（DII）
This database that our library have booked facilitates rapid, precise patent searching, letting you conduct patent and citation searches of inventions in chemical, electrical, electronic, and mechanical engineering. It covers over 14.8 million basic inventions since 1963 from 40 worldwide patent-issuing authorities. Furthermore, it merges the value-added patent information from Derwent World Patents Index with the patent citation information from Derwent Patent Citation Index, so you can use additional descriptive information and coding to quickly grasp a patent's significance and its relationship to other patents.
Chinese Patent Database of the State Intellectual Property Office of the P.R.C