As indicated in A‑VII, 1.3, a divisional application must be filed in the language of the proceedings of the parent application. Alternatively, if the earlier (parent) application was filed in a language other than an official language of the European Patent Office, the divisional application may be filed in that language. In this case a translation into the language of the proceedings for the earlier application shall then be filed within two months of the filing of the divisional application (see A‑III, 14).[Rule 36(2); ]
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/a_iv_1_3_3.htm
Date retrieved: 17 May 2021