Electrical difficulties in patent retrieval

It's hard. According to the query of China Education Network, patent retrieval needs to understand the retrieval characteristics of patent documents in the field of electricity, as well as the ownership of copyright, and the related literature knowledge should be firmly grasped. Electrical retrieval is to introduce the retrieval characteristics and strategies of patent literature in the electrical field from the perspective of technical categories and application distribution, combined with retrieval process and specific cases.