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Dan O'Brien practices intellectual property law, with a focus on patent litigation and intellectual property transactions. His experience also includes patent prosecution, due diligence, and opinion work. These representations involve a variety of technologies, including vehicle telematics, computer architecture, 3D/4D seismology, backup and recovery software, encryption, and telecommunication systems.Prior to joining Jones Day, Dan practiced law at an IP boutique firm in Chicago, where he litigated patents related to graphic accelerators, mobile devices, needleless stents, pacemakers, and nonwoven fabrics. He also prosecuted numerous patents related to biomedical imaging, casino gaming machines, and encryption systems.