Samsung Electronics Co., the world\'s top maker of smartphones, memory chips and flat-panel TVs, estimated Friday it had posted a record quarterly operating profit of 10.1 trillion won (US$9.41 billion) in the third quarter of this year. The preliminary estimate represents a 25.3 percent increase from an operating profit of 8.06 trillion won a year earlier, Samsung said in a regulatory filing. It also marks a 6 percent rise from three months earlier when the tech behemoth posted an operating profit of 9.53 trillion won. The guidance was released before the local stock market opens. Revenue in the July-September period was estimated at a record 59 trillion won, up 13.1 percent from the previous year, according to the company\'s earnings guidance, which did not provide breakdown figures for each of its business units. Samsung Electronics did not disclose its net profit estimate. The company is scheduled to announce its third-quarter earnings later this month.