A federal judge last week dismissed an antitrust case against E.I. du Pont de Nemours & Co. that alleged the Delaware chemical company conspired with three competitors over 11 years to fix the price of a paint ingredient.

U.S. District Judge Richard G. Andrews of the District of Delaware granted DuPont’s motion for summary judgment, finding that paint maker The Valspar Corp. failed to provide sufficient evidence that DuPont participated in a conspiracy to fix the price of titanium dioxide.