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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.
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.
A free resource available through Patents Online Pty Ltd.
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.
Protecting Intellectual Property Rights