Patent ID: 6561229
Filing Date: 2003-05-13
Classification: F16L,Y10S,Y10T

Abstract:
A self-grounding duct for transporting corrosive vapors and gases comprising a laminated inner wall comprising:an innermost layer formed of a cured epoxy vinyl ester resin and having a preselected thickness determined by an interior surface and an exterior surface; and a plurality of electrically conductive, continuous ribbons each having a multiplicity of longitudinal filaments impregnated with said cured epoxy vinyl ester resin, a preselected width determined by opposed generally parallel edges, and a preselected thickness, said ribbons disposed contiguously edge-to-edge to form a carbon band of a preselected width, said carbon band wound in a first plurality of contiguous helical segments forming a continuous first ribbon-layer embedded in said innermost layer and integrated with said interior surface, said first ribbon-layer in a preselected percentage-by-weight relative to the weight of the cured resin.