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This European Patent Office (EPO) database has international coverage and includes an excellent Cooperative Patent Classifcation (CPC) search tool. Translations available to multiple languages.
This free and open database of international patents has a modern, easy to use search interface and offers some unique patent searching tools, including gene sequence searching and patent citation analysis so that you can easily find related patents and other scholarly works.
Google Patent Search
Covers patents made available by the USPTO from the 1790s to the middle of 2006. Search the full text of U.S. patents; use Advanced Patent Search
to search by various criteria including patent number, inventor, and filing date. Does not include patent applications, international patents, or U.S. patents issued over the last few months. Patents can be downloaded as PDF.
Free Patents Online
Patents available in PDF format. Offers chemical search. Use the SureChem gateway to do a chemical patent search on full text collections for United States, European and world patents.
PATENTSCOPE® Search Service enables you to do full-text search in over 1.6 million published international patent applications from the first publication in 1978. Includes 'how to use' videos.
WIPO's (World International Property Organization's) Gateway to Patent Services and Activities.
Chemical Patent Searching
Open Patent Data. A useful guide, specifically geared to chemical patent searching, created as a wiki by Gary Wiggins, an expert in chemical information at the University of Indiana. Concise and informative.
US Patent Law
Information about how to search for patents and the patenting process.
Protecting Intellectual Property Rights