Electrically heated pipe assembly

Abstract From the Canadian patent

PIPE, Abstract of Disclosure, A heated pipe assembly particularly useful with, plastic pipe which comprises a pipe having an, electrically insulating longitudinally-extending outer, surface a pair of conductors extending longitudinally of the outer surface generally parallel to and spaced from each other, an organic plastic sheet wrapped circumferentially around the outer surface of the pipe and a semi-conductor pattern carried on a radiallyfacing surface of the sheet. The semi-conductor pattern comprises a plurality of generally axially-spaced semiconductor stripes and, between adjacent stripes a, portion of the plastic sheet that is free from the semiconductor pattern. The stripes are on …