Under Art. 122(1) EPC re-establishment of rights may be granted to both the applicant and the proprietor of a European patent. Accordingly, it is a legal remedy that is, in general, not available to opponents.
Source: http://www.epo.org/law-practice/legal-texts/html/caselaw/2019/e/clr_iii_e_2.htm
Date retrieved: 17 May 2021