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Find Full-Text Patents
All patents issued in the United States (1790 - current) are searchable from the USPTO's website. There are several other databases that contain this information with different search engines and output features. You may want to explore searching with several of the interfaces to make your search comprehensive.
Google Patents includes patent applications and grants from the USPTO, EPO, JPO, SIPO, WIPO, DPMA, and CIPO. Patents without English full text are machine-translated to English, so you can search foreign patent documents using only English keywords.
USPTO Patent Searching
Allows you to search the full-text of issued patents from the United States Patent and Trademark Office. Images of the patents are only available as .TIFF documents, and you may need to download a .TIFF viewer to open the documents.
From World Intellectual Property Organization (WIPO). Using PATENTSCOPE you can search 77 million patent documents including 3.7 million published international patent applications (PCT).
Lens.org Patent Search
Allows you to search granted patents and applications from the US, Europe, Australia, and beyond. Includes patents from the WIPO. Full-text available as HTML and/or PDF.