Spherodized fluorescent beads for improved roadway pavement mark

Details Spherodized fluorescent beads for improved roadway pavement mark Spherodized fluorescent beads for improved roadway pavement mark

1996-05-23

1999-02-23

Davis, Cassandra H.

Card, picture, or sign exhibiting

Signs

Highway or street marker

40542, 40582, G09F 1316

Patent

active

058731873

ABSTRACT:
Retroreflective glass or plastic beads have fluorescent properties when irradiated with ultraviolet light and are emplaced in signs in patterns indicative of alphanumeric characters, or embedded in a hot melt comprising road stripes or embedded in the road asphalt or aggregate during construction of the road, to provide effectively bright and clear indications of signs or the extent and direction of the road. The glass beads comprise spherodized soda lime, borosilicate, phosphosilicate or aluminosilicate glasses with low levels of rare-earth dopants mixed therein, such as compounds containing one of the rare earths, or lanthanides. The plastic beads may have fluorescent materials mixed therein, typically organic pigments or dyes based on coumarin and rhodamine or the like.

REFERENCES:
patent: 3961112 (1976-06-01), Genevitz et al.
patent: 4250646 (1981-02-01), Trachtenberg

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