A Chinese court temporarily bans Micron chip sales in the country, with patent ruling in favor of Taiwanese rival UMC; Micron says no injunction has been served
A Chinese court temporarily banned Micron Technology Inc. chip sales, cutting the U.S. company off from the world's largest …
Context & Ripple Effects
This 2018 ruling is the opening move in a long arc of Chinese pressure on Micron: a local court blocks sales on a UMC patent claim while Micron disputes that any injunction was even served. Five years later Beijing escalated from patent litigation to an outright national-security warning against Micron's products, and by 2025 Micron had stopped selling server chips to Chinese data centers altogether.
The case also fits a broader pattern of Chinese courts deploying preliminary injunctions against US tech firms — months after this ruling, a court issued a patent-based injunction blocking iPhone sales in China for Qualcomm's benefit. The UMC win is notable given that a Taiwanese court later fined UMC $3.4M over engineers who stole Micron trade secrets for a China-backed firm.
First-order effects
- Micron is temporarily cut off from the world's largest market for its chips on a patent claim it is contesting, while rival UMC gains immediate litigation leverage.
- Micron's public statement that no injunction has been served signals it will fight enforcement rather than treat the ruling as settled.
Second-order effects
- The ruling establishes a template other US hardware vendors would soon face: within months, a Chinese court used the same preliminary-injunction mechanism against Apple's iPhones in a Qualcomm dispute.
Third-order effects
- If the pattern holds, patent and security actions become interchangeable tools for displacing foreign memory suppliers — culminating in the 2023 security ban and Micron's eventual retreat from Chinese data-center sales, which clears shelf space for domestic memory makers.
The trend: China is layering patent litigation and security reviews into a playbook for pushing foreign chipmakers out of its market and seeding a domestic memory industry.