|USPTO Patent Office
||USPTO's database allows users to search for U.S. patents dating back to 1790. You can search by various fields such as inventor name, patent number, and keyword. Visit the database.
||This is provided by the European Patent Office (EPO). Espacenet offers free access to information about inventions and technical developments from the 19th century right up to today. It covers patents from many different countries around the world. Visit Espacenet.
||Google's patent search engine is user-friendly and can be a good starting point for preliminary patent research. It includes patents and patent applications from the USPTO, EPO, and World Intellectual Property Organization (WIPO), among others. Visit Google Patents.
||The World Intellectual Property Organization's database includes over 90 million patent documents from around the world, including international patent applications submitted under the Patent Cooperation Treaty (PCT). Visit PATENTSCOPE.
|China National Intellectual Property Administration (CNIPA) Database
||For patents filed in China, the CNIPA database can be a useful resource. However, the site is primarily in Chinese. Visit the CNIPA database.
|Japan Patent Office (JPO) Database
||For Japanese patents, the JPO provides a database known as “J-PlatPat.” Visit J-PlatPat.