GA C3.1.7 3.1.7.

When is the search fee refunded? 
3.1.026
Where the EPO can base the ISR on an earlier search that it has carried out for an application whose priority is validly claimed for the international application, the international search fee paid will be refunded in part or in full, depending on the extent to which the EPO benefits from that earlier search (see point 2.19.001).
R. 4.12, 12bis, 16.3, 41.1 PCT
OJ 2009, 99
OJ 2019, A5, A82
WIPO PCT Guide 5.073 
3.1.027
No refund is made for an earlier search that was not carried out by the EPO itself and/or if priority has not been validly claimed (see point 2.19.002).

Source: http://www.epo.org/applying/international/guide-for-applicants/html/e/ga_c3_1_7.html

Date retrieved: 17 May 2021

9 references found.

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EPO Guide for Applicants, part II Int.

EPO Guide for Applicants, part II Int. - C The EPO as ISA and SISA

PCT Implementing Rules

Offical Journal of the EPO