The 80-year-old billionaire investor and chairman of Omaha, Nebraska-based Berkshire Hathaway Inc. said at a news conference on May 1 after its shareholder meeting that Brazilian companies are on his "radar screen" and that he would be "delighted to buy businesses in China" as well as Hong Kong. Buffett's comments came less than two months after agreeing to purchase Wickliffe, Ohio-based Lubrizol Corp. for about $9 billion.