Optical: systems and elements – Signal reflector – 3-corner retroreflective
Reexamination Certificate
2004-12-14
2008-01-01
Phan, James (Department: 2872)
Optical: systems and elements
Signal reflector
3-corner retroreflective
C359S529000, C359S834000, C428S327000
Reexamination Certificate
active
07314284
ABSTRACT:
An object of the present invention is to provide a retroreflective sheeting that exhibits proper retroreflection even at a small incident angle with no or less halation, and has superior incident angularities and superior direction characteristics, as well as a film for use in the retroreflective sheeting. The retroreflective sheeting with the above characteristics is obtained by forming reflective elements of a specific triangular pyramidal frustum configuration in a close-packed state on one surface thereof. The shape of the triangular pyramid frustum element satisfies following requirements: one side length of the bottom surface is in the range of 50 to 400 μm, and a difference between a longest side and a shortest side is 200 μm or less; the length of a longest edge is in the range of 50 to 400 μm, and a difference between the longest edge and a shortest edge among the three edges is 100 μm or less; when a vertical line which intersects perpendicularly with the bottom surface is drawn from a top surface to the bottom surface, the length of a longest vertical line is in the range of 20 to 250 μm; and an angle between adjacent side surfaces is in the range of 85 to 95 degrees.
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Koizumi Keishi
Nakatani Kazushi
Kaneka Corporation
Phan James
Sughrue Mion Pllc.
LandOfFree
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