GA C4.1.12 4.1.12.

In which language should the demand be filed? 
4.1.045
The demand must be filed in the language in which the international application was filed, except in the following situations: 
R. 48.3, 55.1 PCT
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If the international application was filed in a language other than the language in which it was published, the demand must be filed in the language of publication (e.g. application filed in Dutch, see point 4.1.044).
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If a translation of the application has to be filed with the EPO as IPEA (see points 4.1.041-4.1.043), the demand must be filed in the language of that translation (e.g. application filed in Spanish, see point 4.1.042).
Language of further correspondence

Source: http://www.epo.org/applying/international/guide-for-applicants/html/e/ga_c4_1_12.html

Date retrieved: 17 May 2021

7 references found.

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EPO Guide for Applicants, part II Int.

EPO Guide for Applicants, part II Int. - C The EPO as ISA and SISA

PCT Implementing Rules