What the club actually did was declare reliever Paco Rodriguez as the 26th man, even though he was already on the active roster, and purchase the contract of Patterson to be on the 25-man roster.
Both players went back to the Minors on Friday, but Patterson was optioned and Rodriguez was "returned." Patterson must remain in the Minor Leagues at least 10 days unless he replaces an injured Dodgers pitcher, but Rodriguez can be recalled at any time.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.