Fibre giant DuPont on Tuesday said first quarter net income including one-time items was $479 million, or 48 cents per share, compared to $495m, or 47 cents per share, in the year-ago quarter. In a statement, the Delaware-based company said consolidated Q1 sales for the were $6.1 billion versus $6.9bn in 2001, with segment sales down 11 per cent to $6.8bn from $7.6bn in 2001.