(June 13, 2016, 1:33 PM EDT) -- NEW ORLEANS —An excess insurer maintains in a June 8 brief filed in the Fifth Circuit U.S. Court of Appeals that a Texas federal judge erred by not requiring any actual proof of when underlying individual plaintiffs were exposed to asbestos (Longhorn Gasket and Supply Co., et al. v. U.S. Fire Insurance Co., No. 15-41625, 5th Cir.)....