DuPont-Toray Co., Ltd. has filed a lawsuit in Tokyo District Court against Ube Industries, Ltd. for allegedly infringing a DuPont-Toray Japanese patent related to formulation and properties of polyimide film used in Chip-on-Flex (COF)1 electronic circuit technology, seeking injunctive relief for the infringement. In its court filing, DuPont-Toray alleged that Ube has infringed Japanese Patent No. 4777471 concerned with DuPont Kapton polyimide film, by manufacturing and selling polyimide film graded as UPILEX SGAV1.
Kapton polyimide film manufactured and sold by DuPont-Toray using the patented technology has been a widely used material for COF substrates globally. As a technology driven company, DuPont-Toray invests significant resources and money in research to develop innovative products for its customers. Its intellectual property enables the company to continue investing in innovative technologies for the circuit and packaging materials market, and to ensure that its customers receive the high performance expected from DuPont-Toray products. DuPont-Toray will continue to take appropriate actions to protect its patent estate against infringement when necessary.
DuPont-Toray Co., Ltd. is a 50-50 joint venture between Toray Industries, Inc., Tokyo, and Du Pont Kabushiki Kaisha, Japan, a wholly owned subsidiary of DuPont, Wilmington, Del., and has produced and sold DuPont Kapton polyimide film since 1985.
DuPont Kapton polyimide film has been a market leader for over 40 years because of its superior temperature endurance, physical, electrical, and chemical properties and proven reliability as a substrate for electronic circuits under the most demanding conditions in consumer, industrial and aerospace applications.