An attorney for the court-appointed custodian in the TransPerfect dispute said in a court filing that a month of mediation between the firm’s warring co-founders has failed, a development that sets up the possibility of key court rulings as the company accelerates toward a court-ordered sale.

Douglas D. Herrmann, who is representing custodian Robert B. Pincus, told a Delaware federal judge on Thursday that Philip R. Shawe and Elizabeth Elting were unable to hash out their deep-seated differences in sessions with former Delaware Court of Chancery Chancellor William B. Chandler III. The court’s current chancellor, Andre G. Bouchard, had ordered the parties to mediation June 2.