Sisvel, Mitsubishi lose first round of SEP infringement case 27-04-2021 13-04-2017 Sisvel and Mitsubishi have suffered a loss in their infringement suit against several Chinese mobile phone manufacturers, as the English High Court ruled that a standard-essential patent (SEP) is not integral to 4G telecom standards. If you have already subscribed please login. If you have any technical issues please email tech support. Sisvel, Mitsubishi, infringement suit, UK High Court, patents-in-suit, 4G telecom standards, Archos, Xiaomi, Oppo/OnePlus, LTE More on this story