Guide for applicants, Part 2: PCT procedure before the EPO (Euro-PCT Guide)

If an applicant enters the European phase without having requested international preliminary examination under Chapter II, the EPO will act as a "designated Office" (see points 408 ff). However, if before entering the European phase the application was processed under Chapter II PCT, the EPO will act in the European phase as an ''elected Office'' (see points 411 ff).