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

Refund of the fee for international preliminary examination
Where the international application or the demand for international preliminary examination is withdrawn before examination has commenced and within 30 months from the priority date, the applicant is refunded 75% of the fee for international preliminary examination. If the demand is deemed not to have been submitted or the fee was paid by mistake, the fee is refunded in full. Any amount paid in excess of the amount due is likewise refunded.
Agreement EPO-WIPO, Annex C‑II
OJ 2010, 304