Patent ID: 7107750

Claim:
A composite yarn of bright color comprising a core surrounded by a casing having an outer surface, the yarn comprising at least: yarn or fibers A of bright color based on polyethylene terephtalate; at least one type of yarn or fibers selected from the following group: temperature-stable yarn or fibers B; and smothering yarn or fibers C causing gas to be given off when subjected to a flame; wherein the outer surface of the casing comprises more than 60% by area yarn or fibers A and wherein the chromaticity coordinates and the luminance factor of the casing are selected from: chromaticity coordinates lying in the ellipse defined by the following (X;Y) pairs of coordinates (0.610; 0.390), (0.544; 0.376), (0.579; 0.341), (0.655; 0.344) with a luminance factor β greater than 0.40; chromaticity coordinates lying in the ellipse defined by the following (X;Y) pairs of coordinates (0.387, 0.610), (0.356; 0.494), (0.398; 0.452), (0.460; 0.540) with a luminance factor β greater than 0.76; or chromaticity coordinates lying in the ellipse defined by the following (X;Y) pairs of coordinates (0.655; 0.344), (0.579; 0.341), (0.606; 0.314), (0.690; 0.310) with a luminance factor β greater than 0.25.