Samsung Electronics will likely need to improve its offer to the European Union regulator to address patent issues with rivals such as Apple Inc., the European Competition Commissioner said on Monday. Samsung may have to improve concessions offered two months ago to end an antitrust investigation into its patent dispute with rival Apple, the European Unions antitrust chief told a business conference. Almunia said the EUs executive arm has market-tested Samsungs commitments and will take account of the feedback when debating possible improvements to the electronics giants commitments in the coming weeks.