Some of China’s largest companies have banded together with major brands in the United States and elsewhere to neutralize the so-called “patent trolls,” an indication that the country’s firms are becoming increasingly concerned about patent infringement litigation.

More than two dozen Chinese businesses, including Alibaba Group Holding Ltd., Ant Financial Services Group, Meituan-Dianping and Yamaha Corp., are now members of the LOT Network, an international nonprofit group created in 2014 to ward off litigation from patent assertion entities. Half of those companies recently joined the group.