Patent ID: 8545986

Claim:
A composite insulated electrical conductor comprising: a conductor; a cured polyimide insulation layer formed around the conductor; and a plurality of integrally embedded layers infiltrated with the cured polyimide; wherein the cured polyimide is integrally formed with the embedded layers from infiltration and in-situ polymerization of monomer reactants comprising: (a) a crosslinking end group selected from the group consisting of the following monomers: wherein R is: (b) an ester selected from the group consisting of dialkyl, trialkyl, and tetraalkyl having the general structure: wherein R is: and wherein Ar′ is a tetravalent aryl radical; and (c) an aromatic diamine; and further wherein said integrally embedded layers comprise: (i) a grading layer embedded inside the insulation layer; and (ii) an earth layer embedded inside the insulation layer and located around the grading layer; and even further wherein said composite conductor is characterized as maintaining its electrical circuit and structural integrity at a temperature of at least about 1600° F. for at least three (3) hours.