 Patterson was promoted to the AA Chattanooga Lookouts in 2012, where he was moved to the bullpen and made 47 appearances, with a 7-1 record and 3.07 ERA.In 2013, with the AAA Albuquerque Isotopes, he was in 39 games (with 12 starts) and was 7-4 with a 3.03 ERA.He was a non-roster invitee to Major League spring training in 2014.