Bloomberg reported that Polypore International Inc.’s Celgard unit has filed a patent-infringement lawsuit against Sumitomo Chemical over a patent issued for a separator in high energy lithium ion batteries used in electric vehicles and electronics.

As quoted in the market news:

Sumitomo Chemical makes the chemicals and materials for lithium ion batteries that use Celgard’s invention without permission, according to the complaint. The separators are used in batteries made by Panasonic Corp. (6752) for laptop computers, Celgard said in the suit.

Click here to read the full Bloomberg report.