TOKYODuPont-Toray has filed a lawsuit in Tokyo District Court against Ube Industries for allegedly infringing a Japanese patent related to formulation and properties of polyimide film used in chip-on-flex circuits.

In its court filing, DuPont-Toray alleges Ube has infringed patent no. 4777471 covering Kapton polyimide film.

The firm says Ube manufactured and sold polyimide film graded as UPILEX SGAV1.

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