Sony was one of the accused in the case U.S. Ethernet Innovations v. many (2009, USA).
Sony was also a target of the CSIRO wifi patent, but this was for manufacturing hardware, not for software development.
Sony's PlayStation 3 has been targeted by LG Electronics for violation of patents on Blu-ray.
- 3D patent suit extended to Dell, HP, IBM, Sony, others, November 4th 2004
- Sony patents two-player 3D technology, July 20th 2010