Patent ID: 9618145
Date: 2017-04-11
CPC Classifications: B32B,C09D,E04F,E21F,F02C,F05D,F16L,H02G,H05F,Y10T

Claim:
1. A duct comprising: a polymeric duct wall circumscribing a fluid-conveyance passage, the polymeric duct wall including an inner surface and an outer surface; and an electrically conductive coating disposed on at least one of the outer surface and the inner surface, wherein the electrically conductive coating includes a layer of copper and a layer of nickel or chrome, the layer of copper interfacing the outer surface or the inner surface on which the electrically conductive coating is disposed and the layer of nickel or chrome interfacing the layer of copper, the layer of copper having a first average thickness and the layer of nickel or chrome having a second average thickness that is less than the first average thickness by a factor of at least 2.