While this ruling may have little impact on Micron's activities in China, the company is still facing an investigation by a Chinese antitrust regulator along with its Korean rivals, the companies have said. The U.S. case is still being heard.
The lawsuits covered three areas, specific memory applications related to DDR4, SSD and memory used in graphics cards.
Micron Technology (NASDAQ:MU) traded 3% higher on Thursday morning, bouncing back after China imposed an injunction on its chips earlier this week, which pushed shares lower.
The dispute follows a ban on USA firms supplying parts to China's telecom equipment maker ZTE as well as the drawn-out wait for Chinese regulators to approve Qualcomm Inc's $44 billion takeover of NXP Semiconductors.
The ban has crippled ZTE's business operations and highlighted China's severe shortage of domestic chips.More news: Roger Federer and Serena Williams leading the race for Wimbledon arena
Analysts believe the ban is largely symbolic as hurting the USA chipmaker would end up creating more pain for local Chinese firms who would have to rely on Korean firms Samsung Electronics and SK Hynix, pushing up memory chip prices.
On Monday, the United States moved to block China Mobile, the world's largest mobile phone service provider, from entering the U.S. market, citing national security grounds.
Much of Taiwanese semiconductor firms' business is conducted with the mainland.
In 2017, Taiwan exported $92.3 billion worth of products from its semiconductor industry, 55.5 percent (worth $51.2 billion) of which went to China and Hong Kong.
"I think that China is using this case as a payback against the USA", said Ho in an interview with the Taiwan branch of New York-based broadcaster New Tang Dynasty Television. Joel Poppen, Micron's general counsel, added that it "will continue to aggressively defend against these unfounded patent infringement claims while continuing to work closely with its customers and partners".More news: Wimbledon: Nadal and Del Potro react to Federer losing Grand Slam record
"UMC is pleased with today's decision", Jason Wang, the company's co-president, said in a statement. UMC is building a DRAM production plant in cooperation with JHICC, a state-owned enterprise under Fuzhou City of China.
Other chipmakers also gained. "Micron believes the ruling issued by the Fuzhou Court in Fujian Province is inconsistent with this proclaimed policy".
China's aim may not be to bar shipments of Micron's chips, instead the ruling may be part of a strategy to push it into a partnership with Chinese semiconductor makers, which could speed up the country's internal chip industry development, according to Stifel Nicolaus analyst Kevin Cassidy.
Micron Technology offers Micron-branded products as well as Crucial-branded notebook DRAM modules and SSD. The global chip market is mainly in the hands of Micron and its two Korean rivals, Samsung Electronics and SK Hynix.More news: The World Cup causes a problem for Atletico's Super Cup squad