For searching patents via the Patent Offices web sites see the Patent Offices tab. Some patents can be found via MSK subscribed to specialized and general science databases- see Subscription Databases tab.
Google Patents covers the entire collection of issued patents and millions of patent application made available by the USPTO, from patents issued in the 1790s through the present.
PatentLens is a worldwide, open-access, free full-text patent informatics resource with features including DNA and protein sequence searching, and search interfaces in Chinese, Russian, and French, as well as English.
