First of all, the most recommended is this:

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Features: Using semantic retrieval technology, you can search in natural language, and it is very convenient to sort according to relevance. It can also realize mutual inspection between Chinese and English. If you register your account for free, you can also read the full text.

Other commonly used websites:

China National Intellectual Property Administration-Patent Search (this search system includes all China patents (including invention patents, utility models and designs) published since the establishment of 1985 China patent system. Search items include application (patent) number, name, abstract, application date, publication (notification) date, publication (notification) number, classification number and application (patent right). Single or multiple compound matching searches can be performed. Search results can browse and download the full text of instructions and design graphics. The manual displays the full text in TIF format, and the online browsing instructions must be installed with the special browser provided by this website) /sipo2008/zljs/

Baidu patent search (Baidu patent search, simple and convenient to query patent information in various fields in China) /sipo2008/zljs/

Baidu patent search (Baidu patent search, simple and convenient to query patent information in various fields in China)/

Soopat Patent Search (including China Patent and World Patent)/Home Page/Index #

European Patent Office Database (European Patent (EP), British Patent, German Patent and other countries, World Patent (WO) and Japanese Patent (PCT) of the World Intellectual Property Organization)/search97cgi/S97 _ cgi.exe? Action = FormGen & ampTemplate=gb/EN/home.hts

Google Patents (US Patents)/Patents

American patent database (an online retrieval system of American patent database made by the US Patent and Trademark Office. Including all full-text data since 1 97665438+1October1,and image scanning data since 1790. It also provides the recent retrieval of related patent applications. The system provides simple retrieval, advanced retrieval, patent number retrieval and other retrieval methods, and can browse the full text) http://patft.uspto.gov/.

Japan Patent Office (JPO online patent retrieval database of Japan Patent Office (English version) contains the scanned drawings of all Japanese patent specifications (including patents and utility models) published after 1976 and 10, in which all specifications after 1993 provide the English full text of machine translation) http://www.ipdl.inpit.

Japan Patent Office (JPO online patent retrieval database of Japan Patent Office (Japanese version) contains all the published Japanese patent specifications (including patents and utility models) after 1976 10), http://www.ipdl.inpit.go.jp/homepg.ipdl..