The granted European patent has to be validated in the chosen countries within 3 months following the publication of the grant. At least one country is to be chosen, otherwise the patent will have no effect. In certain countries the patent can still be validated for an extra fee in a timeframe of additional 3-6 months. The London Agreement regulates the translation requirements in the member states. This homepage offers its validation service considering this. After the publication of the grant the yearly maintenance fee has to be paid in each country in advance. This is the responsibility of the patentee but a patent attorney can also be mandated (specifically). All the changes that take place within 9 months of the grant (e.g. legal succession, change of address) have to be reported both to the EPO and to the national office, after this timeframe only the national office needs to be notified.
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