Optical: systems and elements – Signal reflector – 3-corner retroreflective
Patent
1990-09-21
1992-05-26
Ben, Loha
Optical: systems and elements
Signal reflector
3-corner retroreflective
359530, G02B 5122
Patent
active
051173042
ABSTRACT:
The present invention provides improved, flexible retroreflective articles based upon an optically clear, aliphatic polyurethane polymer. The aliphatic polymer has a plurality of hard chain segments of the formula
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Coderre James C.
Hammar Walton J.
Huang Tzu-Li J.
Nave Mirian D.
Ben Loha
Griswold Gary L.
Kagan David B.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
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