The US International Trade Commission is investigating Samsung for alleged US semiconductor patent infringements against Toshiba.

Samsung’s DRAM memory chips, alpha microprocessors, graphics, and flash memory chips are all under investigation, Reuters reports. The case was sparked by a complaint made by Toshiba on April 22.

Apple has a close relationship with Samsung, in which it once invested $100 million in order to help maintain a steady flow of LCD screens.

A Samsung spokesman told Reuters that the company wants to make an amicable settlement with Toshiba, but would consider a legal response if this wasn’t possible.

The accusations come as Samsung announces plans to invest $427 million in next-generation semiconductor production lines this year. It’s an attempt to meet expected increased demand in the second half of the year.