GL D IV 5 Preparation of substantive examination

5.1 Inadmissibility at a later stage
5.2 Invitation to the patent proprietor to submit comments and communication of opposition to the other parties concerned by the formalities officer
5.3 Filing of amended documents in reply to the notice of opposition
5.4 Communication of observations from one of the parties to the other parties
5.5 Decision concerning the admissibility of an opposition, the patent proprietor being a party
5.6 Examination of the admissibility of an intervention and preparations in the event of an intervention

Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/d_iv_5.htm

Date retrieved: 17 May 2021

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EPO Guidelines - D Opposition and Limitation/Revocation Procedures