of European applications, the procedure up to grant, the opposition procedure and other aspects relating to the prosecution of patent applications under the Convention.

European patent applications may be filed in any language, but they are prosecuted only in one of the three official languages of the EPO - English, French and German. If an application is filed in another language than an official language, a translation must be filed into one of the three official languages, within two months from the date of filing. The official language