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Final Judgment of Chinese Patent Infringement Litigation Asahi Kasei vs. Shenzhen Xu Ran Electronic and Others

Patent Infringement Litigation over separator for lithium ion secondary battery

January 29, 2021
Asahi Kasei Corp.

In August 2018, Asahi Kasei Corporation (Head Office: Chiyoda-ku, Tokyo; President: Hideki Kobori; hereinafter, "Asahi Kasei") filed a patent infringement lawsuit with Shenzhen Intermediate People's Court against Shenzhen Xu Ran (旭冉) Electronic Co., Ltd. and Shenzhen Xu Ran (旭然) Electronic Co., Ltd.* (hereinafter, "Xu Ran Electronic and Others"), both selling separators for lithium ion secondary batteries in Shenzhen, China, as joint defendants, based on Asahi Kasei's Chinese patent (Patent No. ZL200680046997.8) relating to separator for lithium ion secondary battery, seeking an injunction prohibiting Xu Ran Electronic and Others from selling their "single-layer W-scope" battery separators in China and compensation for damages (a total of 1 million yuan).

In April 2020, the Intermediate People's Court rendered a decision upholding Asahi Kasei's claim of patent infringement. In response, Xu Ran Electronic and Others filed an appeal with the Supreme People's Court.

On December 2, 2020, the Supreme People's Court rendered a final decision which fully accepted Asahi Kasei's claim of patent infringement and ordered to stop selling the above products and to pay compensation for damages.

Asahi Kasei will continue to pay close attention to the issues concerning its intellectual property rights and will take, if necessary, proactive measures to protect them.

  • *Distributors of W-SCOPE Corporation (Head Office: Shinagawa-ku, Tokyo) in China

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