that the failure to the observe the original period was despite the applicant having taken all due care (i.e. the applicant has a legitimate reason for missing the deadline). There is some uncertainty as to whether this is an aggregate time limit or a unitary time limit, which can make difference of up to several days as to when it expires. Requests for limitation or revocation Article 105a(1) EPC 2000 introduces a procedure for centrally limiting or revoking a European patent. A request for limitation or revocation may be filed at any time throughout the term of the European patent. Petition for review Article 112a EPC 2000 introduces a procedure for contesting the decisions of the boards of appeal by filing a petition for review. The petition for review can only be based on a fundamental procedural defect and its purpose is not to obtain a review of the application of substantive law. The petition is in fact a restricted form of judicial review, limited to examining serious errors of procedure which might have been committed by the Legal or Technical Boards of Appeal, prejudicing the right to a fair hearing of one or more appellants. Previously it was not possible for a party who did not have his requests granted in an appeal to challenge the final decision of the Legal or Technical Board of Appeal on any grounds. The first petitions for review included R1/08 (application no 97600009), R2/08 (application no 00936978), R3/08 (application no 01943244) and R4/08 (application no 98116534). Laurent Teyssedre, Premières requêtes en révision, Le blog du droit européen des brevets, July 6, 2008. Consulted on July 6, 2008. The first allowable petition for review was decision R 7/09, for a fundamental violation of . Transitional provisions According to Article 7(1) of the Act revising the European Patent Convention of 29 November 2000, "The revised version of the Convention shall apply to all European patent applications filed after its entry into force, as well as to all patents granted in respect of such applications. It shall not apply to European patents already granted at the time of its entry into force, or to European patent applications pending at that time, unless otherwise decided by the Administrative Council of the European Patent Organisation." Pursuant to Article 7(1) and (2) of the Act revising the EPC of 29 November 2000, the Administrative Council decided on 28 June