Adelphia Communications founder John Rigas and his son, the defunct cable company’s chief financial officer, have appealed their fraud convictions to the U.S. Supreme Court.

John Rigas, 82, was sentenced to 15 years and Timothy Rigas, 51, to 20 years for their roles in Adelphia’s collapse. They were convicted in 2004 on multiple charges of securities fraud, conspiracy to commit bank fraud and bank fraud.