Trademark Act Article 42

Entry of transfer in the RegisterA transfer of trademark right shall have no locus standi against any third party unless it is entered in the Register by the Registrar Office.
中文原文 商標法第42條
商標權之移轉,非經商標專責機關登記者,不得對抗第三人。

English translation for reference only; the Chinese text prevails. Not legal advice.