With Google Patent Search, you can now search the full text of the U.S. patent corpus and find patents that interest you.
All patents available through Google Patent Search come from the United States Patent and Trademark Office (USPTO). Patents issued in the United States are public domain government information, and images of the entire database of U.S. patents are readily available online via the USPTO website.
Using the same technology that powers Google Book Search, Google has converted the entire image database of U.S. patents into a format that’s easy to search. You can search the full text of U.S. patents from the Google Patent Search homepage, or visit the Advanced Patent Search page to search by criteria like patent number, inventor, and filing date.
Google Patent Search is currently available in English, and it includes only U.S. patents.