Currently it is possible to extend the European patent to two extension states and in four validation states not party to the EPC. For further details, see A‑III, 12, and subsections.
Date retrieved: 17 May 2021
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EPO Guidelines Foreword
EPO Guidelines - A Formalities Examination
XGL A III 12 Extension and validation of European patent applications and patents to/in states not party to the EPC