Chip designer Rambus has filed antitrust lawsuits against Siemens and Micron Technology, furthering its legal assault on rivals.

The Los Altos, Calif., company filed an antitrust lawsuit in the Superior Court of California on Wednesday. The suit, which also names Hynix Semiconductor and Infineon Technologies, alleges that the four companies together stifled competition in the computer memory chip market.

Read more: CNet News.