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The disputed patents, which are for NAND flash memories and their peripherals, covers eight patents, a Toshiba spokeswoman said.
Lexar, a designer of removable flash-based digital storage media, card readers and ATA controller applications, said the suit appeared to be a tactical move on the part of Toshiba and related to a patent infringement case brought against Toshiba by Lexar in November, which covered alleged infringement of 14 patents.
In the same month Lexar Media also filed suit alleging the theft of trade secrets by Toshiba and two of its subsidiaries.
Lexar said at the time: "Since the inception of Lexar Media in 1996, and including the period from 1997 through 1999 when Toshiba was represented on the board of directors of Lexar Media, Toshiba had access to and was presented with details of Lexar Media's methods of achieving high-performance flash devices that Toshiba has now incorporated into its flash chips and flash systems."