https://www.cnbc.com/2018/05/11/xiaomi-sued-for-alleged-patent-infringement-ahead-of-blockbuster-ipo.html

Chinese smartphone maker Coolpad Group said its unit has sued three group firms of Xiaomi, which last week filed for a Hong Kong IPO that could be worth up to $10 billion, for patent infringement.

Coolpad said in a statement late on Thursday its subsidiary, Yulong Computer Telecommunication Scientific (Shenzhen) filed a lawsuit against Xiaomi Telecom Technology, Xiaomi Technology and Xiaomi Factory in a court in Jiangsu province for using its patent without authorization.