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US Patent and Trademark Office
The role of the USPTO is to grant patents for the protection of inventions and to register trademarks. It serves the interest of inventors and businesses with respect to their inventions and corporate products, and service identifications.
http://www.uspto.gov
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USPTO Public PAIR
View bibliographic data, status, file history, PDF file images ("IFW"), continuity, foreign priority, patent term adjustments & extensions, text & TIFF images of published applications & patents, maintenance fees, and online ordering of copies.
http://portal.uspto.gov/external/portal/pair
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Google Patents
As part of Google’s mission to organize the world’s information and make it universally accessible and useful, we’re constantly working to expand the diversity of content we make available to our users. With Google Patent Search, you can now search the full text of the U.S. patent corpus and find patents that interest you.
http://www.google.com/patents
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