发明名称 |
Internally illuminated retroreflective signs |
摘要 |
Internally illuminated signs incorporating light-transmissive retroreflective sheeting between the internal illumination source and the sign face in position to retroreflect light beamed against the sign face so as to make the signs retroreflective. Preferred sheeting comprises an open web of filaments encased by retroreflective microspheres.
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申请公布号 |
US4005538(A) |
申请公布日期 |
1977.02.01 |
申请号 |
US19750608915 |
申请日期 |
1975.08.29 |
申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
TUNG, CHI FANG |
分类号 |
G09F13/10;G09F13/16;(IPC1-7):G09F7/08 |
主分类号 |
G09F13/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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