Mirror Worlds Technologies, LLC ("Mirror Worlds") owns U.S. Patent Nos. 6,006,227; 7,865,538; and 8,255,439, which claim methods for storing, organizing, and presenting data in time-ordered streams on a computer system.  In 2017, Mirror Worlds filed suit against Meta Platforms, Inc. (formerly Facebook, Inc.) in the U.S. District Court for the Southern District of New York (“District Court”), alleging that several Facebook features infringed the patents.  

On February 28, 2024, the U.S. Court of Appeals for the Federal Circuit (“CAFC”) reversed the U.S. District Court for the Eastern District of New York’s summary judgment decision to dismiss AlexSam, Inc.’s (“AlexSam’s”) lawsuit for breach of contract against MasterCard International Inc. (“MasterCard”). AlexSam owns two U.S. patents directed to prepaid cards that can be used with point-of-sale devices. In 2005, AlexSam granted MasterCard a license to the two patents. In exchange, MasterCard agreed to pay ongoing royalties in the amount of a fee per licensed transaction. The two patents expired on July 10, 2017.