Strength loss indicator for synthetic yarns
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United States of America Patent
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May 10, 2011
Grant Date -
Mar 13, 2008
app pub date -
Nov 13, 2007
filing date -
Feb 16, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A webbing formed of synthetic yarns having an indicator for indicating exposure to ultraviolet light which results in strength loss of said synthetic yarns. The strength loss indicator comprises a strip extending along at least a portion of the webbing. The strip includes a phosphorescent material that produces a glow when exposed to ultraviolet light. The phosphorescent material is adapted to lose its ability to produce a glow over time exposure to ultraviolet light. Advantageously, the ability to glow fades at a rate correlated to the rate of loss of tensile strength of said synthetic yarns due to ultraviolet light exposure to indicate the condition of the webbing.
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