If an appellant is dissatisfied with the decision of the Board of Patent Appeals and Interferences (Board) concerning the rejection of one or more claims, he/she may either (1) file a notice of appeal to the U.S. Court of Appeals for the Federal Circuit or (2) file a complaint with the U.S. District Court of the District of Columbia. The filing must occur within 2 months of the mailing date of the Board's decision or, if a request for reconsideration was filed with the Board, within 2 months of the date of mailing of the Board's action on that request. This time period may not be extended by petition and payment of a fee under 37 CFR 136(a).