When can I expect the international search report (ISR) if I select the EPO as ISA?

For international applications claiming priority from an earlier application (national or international), the EPO acting as ISA usually issues the ISR and a written opinion within three months from its receipt of the search copy. However, if you choose the CNIPA as your receiving Office, the international search cannot start until you have paid the search fee directly to the EPO as the payment of the international search fee is a requirement for the transmission of the international application (search copy) to the EPO acting as ISA.

If your international application does not claim priority from an earlier application, the EPO acting as ISA will usually issue the ISR and written opinion within eight months from the priority date, in accordance with Rule 42 PCT. The EPO observes this eight month period for quality reasons as it ensures that all the relevant prior art has been classified and so can be found and considered by the examiner when performing the international search.