GL E IX 4.2 No examination of multiple inventions in EP phase

Although under PCT Chapter II, where the EPO is the IPEA, the applicant can have multiple inventions examined in one IPER if further examination fees have been paid (or if the examiner has chosen not to invite the applicant to pay further fees), in the European procedure only one invention will be examined.
In cases where protection is sought for an invention not covered by the (supplementary) international search report, by the supplementary European search report or by a search carried out under Rule 164(2) because the search fee due was not paid, the examining division must invite the applicant to limit the application to one invention covered by one of these searches. The procedure under Rule 164(2) is set out in detail in C‑III, 2.3.[Rule 164(2); ]
If after receipt of the (supplementary) European search report or, where applicable, after a communication under Rule 164(2)(b) the applicant files amended claims relating to an invention which differs from any of the originally claimed inventions and which does not combine with these inventions to form a single inventive concept, an objection under Rule 137(5) should be raised (see also F‑V, 13, and H‑II, 6).[Rule 137(5); ]

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EPC Implementing Rules

EPO Guidelines - C Procedureal Aspects of Substantive Examination

EPO Guidelines - E General Procedural Matters

EPO Guidelines - F The European Patent Application

EPO Guidelines - H Amendments and Corrections

PCT Articles