Patent ID: 6680117
Filing Date: 2004-01-20
Classification: D01D,D01F,D02G,Y10T

Abstract:
An electrically conductive yarn having a temperature dependent resistance, said yarn comprising:a flexible non-conducting core; a sheath disposed on the flexible non-conducting core and having a positive temperature coefficient of resistance, said sheath including: a low conductive matrix material which expands with increased temperature; a plurality of distinct electrical conductors intermixed throughout the matrix material; wherein the plurality of distinct electrical conductors provide an electrical conductive pathway through the sheath; wherein the low conductive matrix material has a higher coefficient of expansion than the conductive particles; and wherein expansion of the matrix material separates various conductive particles within the sheath thereby increasing the electrical resistance of the sheath; wherein the sheath provides the positive coefficient of resistance along the length of said yarn; and further including an insulator of non-conducting material disposed over the sheath.