What are the methods of patent retrieval?

Generally speaking, patent database provides three retrieval modes: simple retrieval, tabular retrieval and advanced retrieval. Simple retrieval is similar to intelligent retrieval, which requires high requirements for keywords through automatic keyword classification; Form retrieval can fill in relevant keywords according to different information; Advanced retrieval requires writing retrieval formulas. Everyone's search habits are different, so we can't say which one is better. As far as the retrieval results are concerned, this has a great relationship with the retrieval experience of the retrieval personnel. I suggest you use the form to search, so that you can fill in accurate keywords according to the information you know and get better search results. Retrieval methods: keyword retrieval, ipc classification number retrieval, etc.