The Hague, The Netherlands, July 8, 2026 – ARLANXEO, a leading global synthetic rubber company, reports that the German Federal Patent Court (Bundespatentgericht) has revoked the German part of European patent EP 3 800 714.

This patent, owned by Zeon Corporation, relates to synthetic rubber materials used as cathode binder in rechargeable battery applications, an area of growing importance in electric vehicle and energy storage applications.

The decision follows a patent dispute between Zeon Corporation and ARLANXEO concerning battery binder technology. In 2024, Zeon initiated infringement proceedings at the Munich Regional Court against ARLANXEO entities in Germany and the Netherlands. ARLANXEO subsequently challenged the validity of the patent before the German Federal Patent Court.

In a preliminary opinion issued in July 2025, the Patent Court expressed significant doubts regarding the patent's validity. Following that assessment, the Munich Regional Court suspended the infringement proceedings pending the outcome of the validity challenge.

With the patent now revoked in Germany, the legal basis for the infringement claims in that jurisdiction has been removed. 

“We welcome the Court’s decision, which confirms our position on the invalidity of the patent,” said John Gerrese, General Counsel of ARLANXEO. “The ruling underscores the importance of robust patent standards. It also highlights the critical role of nullity proceedings in ensuring that only valid and enforceable patents are upheld.”

About ARLANXEO:

ARLANXEO is one of the world's largest synthetic rubber producers and a wholly-owned subsidiary of Aramco, one of the world’s leading integrated energy and chemicals companies. ARLANXEO develops, produces and markets high-performance rubbers with a presence at more than 10 production sites in eight countries and four R&D locations around the world. Its products are used in a wide range of applications ranging from the automotive and tire industries to the electrical, construction, and oil and gas industries. For more information, please visit www.arlanxeo.com. Follow us on LinkedIn.

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