Massive government subsidies have led to a huge amount of activity in China’s electric vehicle sector. But key foreign suppliers like LG Chem have faced obstacles in the country as official policies favour local firms. Now, the Korean company and its Japanese partner Toray have filed a US patent suit and an ITC complaint seeking to keep one of these Chinese firms out of the US market. But that is just one of the signs that patent activity in the battery field may be increasing.

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