High refractive index glass beads for high retroreflectivity surfaces
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United States of America Patent
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May 16, 2006
Grant Date -
Nov 3, 2005
app pub date -
Apr 28, 2004
filing date -
Apr 28, 2004
priority date (Note) -
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Abstract
Glass formulations, and a method of converting such glass formulations to glass beads having a refractive index of at least 1.59 and a high level of retroreflectivity, are provided. The methods and formulations provide beads also having high levels of resistance to degradation by environmental exposure.
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