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: Recommended

SciFinder Scholar

Chemical patents worldwide are comprehensively indexed and cross-referenced in Chemical Abstracts. For details, see the CAS Patent Coverage page. SciFinder Scholar links to available free full text patents via ChemPort.

U.S. Patent and Trademark Office

Search and download fulltext U.S. patents since 1976 and patent TIFF images since 1790, plus published applications since 2001.

pat2pdf.org

If you have a patent number, this is a quick and easy shortcut to fetching PDF files of all U.S. patents from the USPTO site without actually going there.

Google Patent Search

Search and retrieve full text of all U.S. patents since 1790. Applications and most recent patents are not included.

FreePatentsOnline

Search US, EP, JP (abstracts), and WIPO (PCT).

espacenet.com

European Patent Office search site for patents and applications: EP, WIPO/PCT, US, GB, FR, DE, JP, and over 70 countries. Free page-by-page PDFs of available documents. (This is the site SciFinder links to for non-U.S. patents.)

DEPATISnet

From the German Patent and Trademark Office. Patents and Applications all in one site and then link to the full text patent when available. PDF fulltext must be downloaded one page at a time.

SurfIP

Singapore-based portal that allows searching of US-1790+, WO-97+, EP-97+, CH, CA, Taiwan and Singapore patents and JP patent abstracts.

Basic Patent Information

Help page and tutorials from the UT Engineering Library.