First of all, you need to determine the accurate English name and accurate classification position of the technical keywords of the technical topic. Then you can search the IPC international classification number and English subject headings in the esp@cenet patent database on the European Patent Office website.
The European Patent Office website Esp@cenet system contains three databases: EP database, WIPO database and Worldwide database. Among them, the Worldwide database is the most complete collection of patent documents in esp@cenet. It is easy to use and can meet most search needs. In the esp@cenet search system on the European Patent Office website, you can select the advanced search mode. The advanced search interface is divided into two areas: the database selection area and the search item input area. The system provides 10 search fields. When searching, you can search in only one search field, or you can perform a combined search in multiple fields. Enter the relevant English technical subject words or IPC international classification number in the corresponding field to search.