Methods of forming retroflective structures having a helical geometry
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United States of America Patent
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Apr 17, 2012
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N/A
app pub date -
Sep 9, 2011
filing date -
Aug 10, 2007
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Expired
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Abstract
Retroreflective structures and methods of forming the same comprise a body of material extending along a helical path about a longitudinal axis and a plurality of retroreflective optical elements positioned along the helical path of the body of material, and constructed and arranged to retroreflect electromagnetic energy directed from a range of angular orientations about the longitudinal axis.
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