Profits at US chemical firm DuPont stagnated in the second quarter as weak US construction and auto industries cut into its sales, the firm said Tuesday, according to dpa. Quarterly profits remained at 1.04 dollars per share, while decreasing to 972 million dollars from a year-earlier 975 million dollars, the Wilmington, Delaware-based company said. Revenue dropped 1 per cent to 3.3 billion dollars in the US, but increased by 12 per cent in Europe to 2.3 billion dollars. Overall, quarterly revenues increased 6 per cent to 7.9 billion dollars. In the first half of the year, DuPont earned 1.9 billion dollars, over 1.8 billion last year. Earnings per share were 2.05 dollars, versus 1.92 dollars a year earlier.