Company overview. Sony Mobile Communications AB (Swedish entity) and its U.S. counterpart Sony Mobile Communications Inc. ("SOMC") were the handset subsidiaries of Japan's Sony Corporation. The business descends from Sony Ericsson Mobile Communications, a 50/50 Sony–Ericsson joint venture formed October 1, 2001. Sony acquired Ericsson's half for €1.05 billion, closed the deal in February 2012, and renamed the unit Sony Mobile Communications; headquarters moved from Lund, Sweden to Tokyo in 2013. Sony's 2012 press materials cited roughly 8,000 employees and €100 million in stated capital. Standalone revenue was not separately reported — the unit was consolidated into Sony's mobile/electronics segments. On April 1, 2021, SOMC merged with Sony Electronics, Sony Imaging Products & Solutions, and Sony Home Entertainment & Sound Products into one company renamed "Sony Corporation," extinguishing the Sony Mobile legal entity.
Products / operations. SOMC designed, developed, manufactured and sold mobile phones, chiefly Android smartphones under the Xperia brand (Xperia 1, 5 and 10 series) and related accessories. Sony has since moved Xperia assembly to third parties and now sells the line mainly in Japan, Europe, Taiwan and Hong Kong. This is clearly an operating company, not a patent-holding shell.
Litigation posture. The tracked data show a single case with Sony Mobile named as defendant and never as plaintiff (0 plaintiff / 1 defendant) — the profile of an operating company being sued, not a patent assertion entity.
Notable cases. Raytheon Company v. Sony Kabushiki Kaisha et al., No. 2:15-cv-00342 (E.D. Tex., Marshall Division, filed March 6, 2015; Judge Rodney Gilstrap), named Sony Mobile Communications (USA), Inc. and Sony Mobile Communications, Inc. alongside other Sony entities, Apple and OmniVision. The Marshall Division is a notoriously plaintiff-friendly venue. Raytheon, itself a large defense/aerospace operating company, asserted U.S. Patent 5,591,678 on microelectronic device fabrication. Sony filed IPR petitions (IPR2015-01201; IPR2016-00209, consolidated with Samsung's); the PTAB invalidated all claims, and the Federal Circuit affirmed in 2018 (No. 17-1554).