Rule 11.9(b)

11.10(b)

5.107. **How are chemical or mathematical formulae to be represented?** The description, the claims and the abstract may contain chemical or mathematical formulae. Such formulae may be written by hand or drawn if necessary but it is recommended that appropriate drafting aids or materials such as stencils or transfers be used. For practical reasons formulae may be grouped together on one or more sheets in the description and paginated with it. It is recommended in such cases that each formula be designated by a reference sign and the description should contain references to such formulae whenever necessary. Chemical or mathematical formulae may also be grouped together and be placed after the claims as drawings. In such a case, the chemical or mathematical formulae must be drawn to comply with the requirements for drawings and the sheets must be numbered as drawing sheets (see paragraph 5.157).

Rule 11.9(b)

11.9(d)

11.13(h)

5.108. Chemical or mathematical formulae must employ symbols in general use and must be drawn in such a way that they are completely unambiguous. Numerals, letters and signs which are not typed must be legible and identical in form in the various formulae, irrespective of the element of the international application in which they appear. Chemical or mathematical formulae appearing in the text of the international application must have symbols the capital letters of which are at least 0.28 cm high. Where they appear on sheets of drawings, these symbols must be at least 0.32 cm high. All mathematical symbols used in a formula which appear in a description or on sheets of drawings should be explained in the description, unless their significance is clear from the context. In any case, the mathematical symbols used may be collated in a list.

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### PCT Implementing Rules

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### PCT Applicant's Guide - International Phase

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