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This is the European Patent Office's patent search tool which has access to information about inventions and technical developments. Search for worldwide patents by keyword, inventor, patent number, country.
FreePatentsOnline.com provides fast, easy-to-use access to millions of patents and patent applications. With the most powerful patent search engine on the web, and an ever-expanding data collection, FreePatentsOnline is rapidly becoming the premiere way to search patents. And it's free!"
With Google Patent Search, you can now search the full text of the U.S. patent corpus and find patents that interest you. Search for patents via Google Scholar by entering the keyword, patent number, or citation search. Has a comprehensive list of citations to.
SciFinder provides desktop access to Chemical Abstracts and related databases from CAS. Search more than 8000 journals and patent references (from over 32 patent-issuing organizations). It also includes more than 26 million substance records and CAS Registry Numbers.
Date coverage: 1907-present (articles and patents); 1955-present (substances).
Search full text US patents by keyword, name or the cooperative patent classification (CPC) number. Please note, the images need a special TIFF viewer to display. Go to http://www.uspto.gov/patft/help/helpfaq.htm, or http://www.uspto.gov/patft/help/images.htm for more information. The special viewer can be downloaded at http://www.alternatiff.com/.