Primarily EU patents, but does contain US, WIPO, and more. Easy to navigate and search. Provides linked categories to help explore patents in a particular area. Excellent classification (CPC) browser.
Full text searchable international patents.
United States Patent and Trademark Office Patent Public Search
Search for patents by application number, patent number, PCT number, publication number, or international design registration number.
Intellectual property rights granted by U.S. agencies do not extend to foreign countries. If you are interested in intellectual property rights such as patents, trademark, or copyright in foreign countries, applications must be submitted for those countries. The resources below provide information on seeking international intellectual property.