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Offers an integrated, all-in-one patent and application database for US patents, derived USPTO. Ad-supported, it offers help embedded in the search menus and reference searching.
Most patent offices provide free access to patent documents via public databases. The following are some of the largest and most popular patent office databases: Queen's University Library Patent's and Designs Page
Highlights features of free patent search tools, including Google Patents and Espacenet, as well as other databases. Published in 2017 by the Intellectual Property Owners Association.
