With 266 patents published between 2002 and 2022, Sumitomo Electric Industries Ltd holds the most number of patents in the Mining sector in Japan, of which 63.9% was contributed by its subsidiary SUMITOMO ELECTRIC HARDMETAL CORP..
The second largest number of patents were published by Kyocera Corp with 130 related patents. The third largest number of patents were published by Sandvik AB with 118 related patents, of which 45.8% was contributed by its subsidiary Sandvik Intellectual Property Aktiebolag. The fourth largest number of patents were published by Mitsubishi Heavy Industries Ltd with 84 related patents. The fifth largest number of patents were published by Berkshire Hathaway Inc with 79 related patents.
The top five patent holders, i.e., Sumitomo Electric Industries Ltd, Kyocera Corp, Sandvik AB, Mitsubishi Heavy Industries Ltd, and Berkshire Hathaway Inc, together held 677 patents during the period.
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