Intellectual Property Case Adjudication Rules Article 25

If a party appoints an agent ad litem as rectification within the prescribed time limit in accordance with Paragraph 2, Article 12 of the Act after instituting litigation such as filing a complaint, appeal, motion, interlocutory appeal, or action or motion for retrial, the litigation is ratified by the agent ad litem with effect from the time of the litigation retroactively.If a party appoints an agent ad litem as rectification beyond the prescribed time limit, its litigation is ratified by the agent ad litem with effect from the time of ratification.The court shall dismiss the litigation by ruling if the ratification in the preceding paragraph is made after the peremptory period of the litigation.
中文原文 智慧財產案件審理細則第25條
當事人自為起訴、上訴、聲請、抗告、再審之訴或聲請再審之訴訟行為後,依本法第十二條第二項規定遵期補正委任訴訟代理人者,其訴訟行為經訴訟代理人追認,溯及於行為時發生效力。
當事人逾期補正委任訴訟代理人者,其訴訟行為經訴訟代理人追認,自追認時起發生效力。
前項之追認,已逾該訴訟行為之法定不變期間者,法院應以裁定駁回之。

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