Enforcement Rules of the Patent Act Article 19

Unless absolutely necessary, the technical features of all the claim(s) may not be defined by referring to the page number(s) or line number(s) of the description, drawing(s) or reference sign (s) in the drawing(s).The technical features of the claim(s) may refer to the corresponding reference sign(s) in the drawing(s), and the reference sign(s) shall follow the corresponding technical features and be placed in parentheses; the reference sign(s) may not serve to limit the interpretation of the claim(s).The claim(s) may contain the chemical or mathematical formulae but not drawing(s).A technical feature in a claim for an invention which consists of a combination of multiple technical features may be expressed in means-plus-function or step-plus-function language. Such claim shall be interpreted to cover the corresponding structure, material, or acts described in the description and equivalents thereof.