Elpida said Wednesday it has sued Nanya in the U.S. and Taiwan for DRAM patent infringements.
The Japanese DRAM maker said it has filed a suit with the (ITC) International Trade Commission in the U.S. to stop imports of products that violate seven of its patents. It also filed to stop sales and production of related products with the Taiwan Intellectual Property Court related to four patents.
In September, Elpida filed a lawsuit in a district court in California over DRAM patents. The company said it has been in negotiations with Nanya in the months since, as it deserved "very large compensation" for the infringements.
"Elpida has determined that Nanya has no intention to finalize negotiations and so has decided to issue further lawsuits," the company said in a press release.
Nanya said the company had no comment at this time because the company hasn't received the filed lawsuit.
Faced with an oversupply of chips on the market and the rising yen, Elpida said in September that it is considering shifting some production out of Japan to a subsidiary in Taiwan. The company suffered a 56.76 billion yen ($728 million) loss in the first six months of its fiscal year.
(Michael Kan in Beijing contributed to this story)