Derwent Manual Code Co-Occurrence: A Practical Method in Patent Map

Derwent innovation index,covering the most patents in the main countries or regions,was one of the databases frequently used.Derwent manual code,a feature of the database,was arranged with layered structure,with the function as "Key words" or "thesaurus" has in the academic paper.So the paper extended Derwent manual code co-occurrence to patent map,and took the PCT patents of Huawei technologies company as example to demonstrate its effectiveness in describing the assignee's technology focuses.