All five US financial regulators have approved the Volcker rule, designed to restrict the finance industry in the wake of the 2008-09 financial collapse. Named after former Federal Reserve chairman Paul Volcker, it bans banks from using their own funds for trading activities and it is considered the centerpiece of the 2010 banking reform legislation known as Dodd-Frank.Banks will have until 21 July 2015 to comply with the rules.