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Guide for applicants, Part 1: How to get a European patent

Language arrangements to assist applicants from certain contracting states
If you (or one of your co-applicants) have your residence or principal place of business in a contracting state that has a language other than English, French or German as an official language, or if you (or one of your co-applicants) are a national of such state but are resident abroad, and you may file a European patent application and/or the request for examination in one of the state's official languages., you will be entitled to a 20% reduction in the filing and examination fees (see also point 45).
If you as an applicant are a natural person, a small or medium-sized enterprise, a non-profit organisation, a university or a public research organisation, you are entitled to a 30% reduction of the filing and/or examination fee. In order to benefit from the reduction, you must submit a declaration of entitlement at the latest by the time of payment of the (reduced) filing or examination fee.
Rule 6(4) EPC
If point 44 applies to you, at any time in the procedure after filing your application you may file any documents subject to a time limit in an official language of your state; but within one month of filing any such document you must submit a translation into the language of the proceedings.
However, if you use the official language of your state for filing an opposition, appeal or petition for review, you can file the translation into one of the official languages of the EPO within the opposition, appeal or petition for review period respectively, if that period expires after the one-month period mentioned in point 45. If you do not file the translation in due time, the document is deemed not to have been filed.
The fee reduction mentioned in point 44 also does not applies apply to the fees for opposition, appeal, petition for review, limitation and revocation.