A party to appeal proceedings may file a petition for review. To do so, the party must however have been adversely affected by the Board of Appeal's decision. The prescribed contents of the petition for review is laid out in. The petition must be filed with a time limit of 2 months from the notification of the Board of Appeal's decision, except when based on the grounds that a criminal act may have affected the decision of the Board of Appeal. In the later case, the petition must be filed "within two months of the date on which the criminal act has been established", but no later than five years after notification of the Board of Appeal's decision. Furthermore, a fee must be paid. The review procedure has no suspensive effect on the Board of Appeal decision. If the petition is allowable, the Enlarged Board of Appeal sets aside the decision and re‑opens proceedings before the Boards of Appeal.
Obligation to raise objections (Rule 106 objection)
Under, "a petition under Article 112a, paragraph 2 to, is only admissible where an objection in respect of the procedural defect was raised during the appeal proceedings and dismissed by the Board of Appeal, except where such objection could not be raised during the appeal proceedings." In other words, unless the reason for an objection comes into light only in the written decision of the Board of Appeal, not raising an objection under Rule 106 EPC as early as possible during the appeal proceedings may be fatal to the admissibility of a petition for review. An objection under Rule 106 must be immediately recognizable by the Board of Appeal and it must be specific, i.e. "the party must indicate unambiguously which particular defect of those listed in paragraph 2 to of Article 112a and Rule 104 EPC it intends to rely on".
Grounds for review
There are five sets of grounds for review as laid out in. The available grounds are strictly limited to these enumerated grounds. The ground for review that a violation of occurred is one of those most expected to be relied upon and, at the same time, it leaves much room for argument. However, a procedural error marring the appeal proceedings does not, by itself, suffice to guarantee a successful petition. There must be a causal link between the alleged procedural defect and the damaging decision. Otherwise, the defect was not decisive and hence not fundamental.
Procedure
The actual procedure for examination of the petitions for review involves two stages.
First stage: Rejection of clearly inadmissible or unallowable petitions
First, a three-member Enlarged Board decides whether the petition is clearly inadmissible or unallowable. If so, the petition is thrown out immediately. This first stage is "a quick screening process to be conducted by a three-member panel of the Enlarged Board in order to reject petitions which clearly cannot succeed." It is, in other words, a sifting process. To reject a petition as clearly inadmissible or unallowable, the three-member panel has to reach the decision unanimously. The decision is taken based only on what is in the petition, and the other party or parties, if any, are not involved and not invited to oral proceedings during that first stage. Most petitions are rejected during this first stage.
Second stage: Five-member examination
Secondly, if the petition is not rejected during the first stage, a five-member Enlarged Board examines the petition as to its merits. If the petition is allowable, the decision is set aside, the case is re-opened and sent back to the Board which took the reviewed decision, and the fee paid upon filing the petition for review is reimbursed to the successful petitioner. The Enlarged Board of Appeal has also the power to replace members of the Board of Appeal who took the reviewed decision.
Statistics
The first petitions for review included R1/08, R2/08, R3/08 and R4/08. The first allowable petition for review was decision R 7/09, for a fundamental violation of Article 113 EPC.
