WASHINGTON (Reuters) - Treasury Secretary Timothy Geithner said on Thursday that China is holding to its decades-old strategy to steal American intellectual property, in a pointed statement reflecting U.S. officials' growing impatience with Beijing. "They <China> have made possible systematic stealing of intellectual property of American companies and have not been very aggressive to put in place the basic protections for property rights that every serious economy needs over time," Geithner told a forum in Washington. "We're seeing China continue to be very, very aggressive in a strategy they started several decades ago, which goes like this: you want to sell to our country, we want you to come produce here ...