Patent ID: 7111445

Claim:
A composite heat resistant sewing thread comprising: a) a core formed of at least one strand of a yarn having an elongation of at least 3%; b) at least one bottom cover wrapped around the core in a first direction at a rate sufficient to provide substantially complete coverage of the core by the bottom cover, wherein the bottom cover has an elongation of less than 1% and is made of a high-tenacity yarn; c) at least one outer cover wrapped around the at least one bottom cover, wherein the outer cover is wrapped in a second direction opposite to a direction of a cover layer on which the outer cover is directly wrapped, at a rate sufficient to provide substantially complete cover of the cover layer on which the outer cover is directly wrapped; d) at least one bonding agent applied onto the at least one outer cover; and e) a lubricant; wherein the composite heat resistant sewing thread remains intact when subjected to temperatures exceeding 1,000° C.