1977-07-05
1980-01-08
Corbin, John K.
350 97, G02B 512
Patent
active
041825489
ABSTRACT:
A retroreflective marking material is disclosed comprising a sheet having at least some light-transmitting portions, a light-refracting surface on one side, and a plurality of trihedral light-reflecting units of three mutually perpendicular facets on the other side adapted to be adhered to a working site. The light-reflecting units are oriented to reflect light having relatively high angles of incidence with respect to the sheet. The marking material may be used as a tape for marking roads and is effective whether wet or dry. Optionally, the sheet or tape has light-receptors which rise above the tape and are spaced apart along one direction of the tape, and the trihedral light-reflecting units are substantially opposite the light-receptors. Preferably, the light-reflecting units have the shape of a triangular-based pyramid, and the marking material retroreflects the light in two opposite directions.
REFERENCES:
patent: 2991698 (1961-07-01), Leubaz
patent: 3587415 (1971-06-01), Eigenmann
patent: 3790293 (1974-02-01), Heenan et al.
patent: 3922065 (1975-11-01), Schultz
patent: 3980393 (1976-09-01), Heasley et al.
patent: 4020211 (1977-04-01), Eigenmann
patent: 4040760 (1977-08-01), Wyckoff
Heasley James E.
Searight Charles E.
Corbin John K.
de los Reyes B. W.
Ferro Corporation
Simmons Milton L.
Taylor Wesley B.
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