1, China National Intellectual Property Administration, China website:
(1) field retrieval:
The system provides 16 retrieval fields. Users can choose from 16 search items according to known conditions, and can perform single-field search or multi-field limited search. Each search field can be searched by fuzzy method, and any letter, number or word can be represented by% (which must be in half-width format); Multiple fuzzy character can be used, and that first position can be omit anywhere the search string is entered.
(2)IPC classification retrieval
IPC classified navigation retrieval refers to the use of various departments, categories and subcategories in the IPC category table to gradually query the category of interest, and click on the name of this category to get the patent retrieval results under this category (except design).
Specialized Wisdom-Patent Service Platform to Answer Your Questions:
IPC classified navigation retrieval also provides keyword retrieval, that is, keyword retrieval is carried out within the scope of invention names and abstracts under a certain category to improve the retrieval accuracy.
2.IncoPat scientific and technological innovation information platform
3. China Patent Information Network
4. China Intellectual Property Network
5.innojoy patent search engine
6.Baiteng.com patent retrieval system.
7. Patent Star-Patent Retrieval System
8.SOOPAT patent search engine
9.PatSnap wisdom bud patent retrieval system