Strengthen knowledge accumulation in related fields. The essence of patent classification is to classify by field. The more the searcher knows about related fields, the more helpful it is to determine the classification and keywords reasonably.
Improve the level of foreign languages. European patents are in English, and the same technical features may be expressed in different ways. Therefore, improving English is helpful to patent retrieval.
Reasonably determine the retrieval strategy. When searching, according to the specific situation, it may be the retrieval of classification number and keyword, or it may be the retrieval of classification number and keyword. Comprehensive use of keywords, classification numbers and operators to construct retrieval expressions.