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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
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.
Allows you to search granted patents and applications from the US, Europe, Australia, and WIPO. Full-text available as HTML and PDF.
Applies Google searching technology to the USPTO's database of patents. Patents are available as PDFs. **Note: Google used OCR technology to scan the documents from the USPTO's database and some mistakes are in the system. Check your results.
From World Intellectual Property Organization (WIPO). Using PATENTSCOPE you can search 7,786,506 patent documents including 1,901,679 published international patent applications (PCT).