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patentscope.wipo.int

this patent search tool allows you not only to search the pct database of about 2 million international applications but also the worldwide patent collections. this search facility features: flexible search syntax; automatic word stemming and relevance ranking; as well as graphical results.

innojoy.com

innojoy专利搜索引擎收录全球105多个国家1.4亿多件专利数据,简单易用.专利搜索,innojoy专利搜索,中文专利搜索引擎,专利检索,专利查询,专利下载,发明专利查询网,为我国颇具创新能力的科学家、研发人员、法律专业人士等提供技术情报和研发决策支持,帮助我国用户参与全球性竞争。

incopat.com

incopat global patent database, support ipc query tool, suppot using ipc number to search for related technology classification or use key words to find out related ipc number. while there is no matched classification number, the system will help recommend related numbers through ai.free trial ! use english and chinese to search 140 million patents of 120 authorities. reliable data source, ai search, 3d analyze. support 296 searching fields including patent litigation, patent family, citation and so on.

patents.google.com

search and read the full text of patents from around the world with google patents, and find prior art in our index of non-patent literature.

uspto.gov

Home page of the United States Patent and Trademark Office's main web site.

wipo.int

Questions and answers on industrial designs. Covers basics, applying for industrial design protection, and designs for business.

patentstar.com.cn

专利之星检索系统