On 15 April 2011, Apple sued Samsung in the United States District Court for the Northern District of California, alleging that several of Samsung's Android phones and tablets, including the Nexus S, Epic 4G, Galaxy S 4G, and Galaxy Tab, infringed on Apple's intellectual property: its patents, trademarks, user interface and style.[10] Apple's complaint included specific federal claims for patent infringement, false designation of origin, unfair competition, and trademark infringement, as well as state-level claims for unfair competition, common law trademark infringement, and unjust enrichment.[11][12]