In the past decades, Hitachi Metals, a leading Japanese materials manufacturer has been firmly controlling the NdFeB export markets with over 600 NdFeB related patents worldwide. In order to break the patent blockade, seven Chinese rare earth enterprises aligned with each other and planed to challenge the validity of some patents of Hitachi Metals in the U.S.. It is reported that some Japanese enterprises such as Sumitomo Corporation and Hitachi Metals have once launched 337 investigations against Chinese enterprises in the U. S.
(Source: China IP magazine)
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