GA E I 2 When can the EPO act as designated Office?

Since all EPC contracting states are PCT contracting states, the EPO can act as a designated Office for any EPC contracting state, provided the international application was filed on or after the date on which the EPC entered into force for the state concerned (see point 31).
If this requirement is not met it may be that an extension agreement was in force on the international filing date that provides for the extension of a European patent to the state for which patent protection is sought (see points 122 ff).
Furthermore, a European patent for any EPC contracting state can be obtained only if neither the application nor the (automatic) designation of the state concerned for a European patent during the international phase has been (deemed) withdrawn. 

6 references found.

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EPO Guide for Applicants, part II Int.

EPO Guide for Applicants, part II Int. - A General Overview

EPO Guide for Applicants, part II Int. - B The EPO as a PCT receiving Office

EPO Guide for Applicants, part II Int. - E Euro-PCT procedure before the EPO as designated or elected Office

PCT Implementing Rules