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Microsphere-based retroreflective article
   
Document Number
US Patent 5777790
Issued Date
July 7, 1998
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Inventors
Nakajima; Toshitaka (Yamagata pref.,JP)
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Abstract
A retroreflective article comprising a monolayer of microspheres partially embedded in and protruding from a binder layer and specular reflector underlying the microspheres, wherein the monolayer of microspheres comprises a mixture of a first class of microspheres having a first refractive index and a second class of microspheres having a second refractive index wherein the second refractive index is higher than the first refractive index. As a result, the sheeting exhibits superior observation angle angularity.
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Microsphere-based retroreflective article - US Patent 5777790 Drawing
Drawing from US Patent 5777790
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Number of Claims:
10
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Published
July 7, 1998
Application Number
08/721,982
Filed
October 4, 1996
US Classification
359/536   359/538 359/539 359/540 359/541
Int'l Classification
E01F   9/04   (20060101)   G02B   5/128   (20060101)   G02B   5/12   (20060101)  
Examiner
Attorney/Law Firm
Priority Data
Apr 07, 1994 [JP] 6-069426
USPTO Field of Search
359/534   359/535   359/536   359/537   359/538   359/539   359/542   359/540   359/541  
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