JPO rejects Baoshan bid to invalidate Nippon Steel EV motor steel patent
By Toko Sekiguchi ( May 12, 2026, 08:05 GMT | Insight) -- Japan’s Patent Office upheld Nippon Steel’s patent for ultra-thin electrical steel used in high efficiency EV motors, rejecting an invalidation challenge by China’s Baoshan Iron & Steel that argued the company improperly narrowed its claims using performance numbers pulled from working examples — a dispute now under review at Japan’s Intellectual Property High Court.Japan’s Patent Office upheld Nippon Steel’s patent for ultra-thin electrical steel used in high efficiency EV motors, rejecting an invalidation challenge by China’s Baoshan Iron & Steel that argued the company improperly narrowed its claims using performance numbers pulled from working examples — a dispute now under review at Japan’s Intellectual Property High Court....
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