Toshiba Corp, a top maker of flash memory chips used in smartphones, said on Tuesday it has filed suit in a Taiwan court against Taiwans Powerchip Technology Corp and three other firms charging infringement of its flash memory patents. A Toshiba spokesman said the company was seeking T$100 million ($3.3 million) in compensation in the case. In March, Toshiba also filed suit against South Koreas SK Hynix Inc seeking damages in a case over suspected theft of data related to its flash memory chip technology.