Enforcement Rules of the Patent Act Article 20
Where an independent claim of an invention is presented in two-part form, the preamble portion shall contain the designation of the subject matter as claimed and those essential technical features that the subject matter as claimed and the prior art are in common; the characterizing portion shall state the essential technical features of the invention which distinguish the subject matter as claimed from the prior art in such phase as “characterized in that,” “wherein the improvement comprises,” or in similar expressions.The technical features of the characterizing portion shall be in combination with those of the preamble portion in interpreting such independent claim.
中文原文 專利法施行細則第20條
獨立項之撰寫，以二段式為之者，前言部分應包含申請專利之標的名稱及與先前技術共有之必要技術特徵；特徵部分應以「其特徵在於」、「其改良在於」或其他類似用語，敘明有別於先前技術之必要技術特徵。
解釋獨立項時，特徵部分應與前言部分所述之技術特徵結合。
解釋獨立項時，特徵部分應與前言部分所述之技術特徵結合。