koppers holdings inc said thursday that currency translations softened a decrease on thirdquarter sales the pittsburghbased supplier of wood products and chemicals said consolidate sales fell 29 in the quarter versus a year earlier to 4248 million but the loss was higher if fx gains were excluded excluding a 17 million favorable impact from foreign currency changes sales decreased by 144 million or 33 percent from the prior year the company said the wsj dollar index was up 19 in the third quarter according to dow jones market data