On March 18, 2011, Imperium (IP) Holdings filed a lawsuit in the Eastern District of Texas accusing seven companies of infringing five of its patents. Imperium claims that LG, Kyocera, Nokia, Motorola Mobility, Apple, Sony and RIM have all committed infringement by manufacturing, selling or importing cell phones. The asserted patents all relate to image sensors and, in particular, photodiodes. Each of the five patents came to ESS Technology, Inc. as part of its 2003 acquisition of Pictos Technologies, Inc. from Conexant Systems, Inc.
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