The request for re-establishment of rights must be filed in writing within two months from the removal of the cause of non-compliance with the time limit. The omitted act must be completed within this period. As a general rule, the request is admissible within the year immediately following the expiry of the unobserved time limit. However, the time limit for requesting re-establishment of rights for the priority period or for filing a petition for review by the Enlarged Board of Appeal constitutes an exception to this general rule: in these cases, the request must be filed within two months of expiry of the relevant period laid down in Art. 87(1) and Art. 112a(4).