National Intellectual Property Administration (CNIPA)
Patent Search and Analysis
Patent search tool by National Intellectual Property Administration, PRC.
European Patent Office (EPO)
Espacenet
European Patent Office patent search tool with access to information about inventions and technical developments from the 19th century to the present.
United States Patent and Trademark Office (USPTO)
Patent Full-Text and Image Database (PatFT)
United States Patent and Trademark Office patent search.
PATFT starts from 1790.
AppFT starts from March 2001.
Japan Patent Office (JPO)
Japan Platform for Patent Information (J-PlatPat)
Access to patent information including utility-model, design, trademark, etc. Provided by The Japan Patent Office (JPO) and the National Center for Industrial Property Information and Training (INPIT).
Korean Intellectual Property Office (KIPO)
Korean Intellectual Property Rights Information Service (KIPRIS)
Searches for patents, trademarks and designs.
World Intellectual Property Office (WIPO)
PATENTSCOPE
Searchable database of more than 35 million international and national patent documents. "Provides access to international Patent Cooperation Treaty (PCT) applications in full text format on the day of publication. The information may be searched by entering keywords, names of applicants, international patent classification and many other search criteria in multiple languages."
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Patent Lens is a worldwide, open-access, free full-text patent informatics resource.