The Wisconsin Supreme Court, in a closely watched case, has ruled that a young boy who was exposed to lead paint cannot sue the manufacturers for defectively designing a key ingredient.

In a July 14 ruling, the state Supreme Court affirmed the decisions of both lower courts in granting a motion to dismiss the claims, which were brought against E.I. du Pont de Nemours and Co., the Sherwin-Williams Co., Armstrong Containers Inc. and American Cyanamid Co. The case involves a child who alleges that he was exposed to an ingredient in lead paint called white lead carbonate pigment, which existed in paint chips, paint flakes and dust containing paint at his apartment in Milwaukee.