High incidence angle retroreflective material

Details High incidence angle retroreflective material High incidence angle retroreflective material

1976-12-01

1982-09-14

Silverman, Stanley S.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428178, 428332, 428337, 428913, 350286, 350292, 350102, B32B 330

Patent

active

043495982

ABSTRACT:
Retroreflective film, sheeting or the like having an array of light-reflecting right triangle prisms between a transparent surface layer and a backing layer. The opposing triangular end faces of adjacent prisms are spaced apart to provide internal reflection therefrom. The retroreflective material provides efficient retroreflection at angles of incidence of about 30.degree.-85.degree. and therefore is effective where light is directed in a path nearly parallel to a reflective surface, such as highway lane dividers or guardrail markers placed parallel to a highway. Retroreflective material on such markers becomes visible to an observer while yet remote from the markers.

REFERENCES:
patent: 2911682 (1959-11-01), Ewald
patent: 3450459 (1978-06-01), Haggerty
patent: 3541606 (1970-11-01), Heenan et al.
patent: 3712706 (1973-01-01), Stamm
patent: 3716445 (1973-02-01), Lemelson
patent: 3923378 (1975-12-01), Heenan
patent: 3935359 (1976-01-01), Rowland
patent: 3962402 (1975-12-01), Heenan
patent: 4066331 (1978-01-01), Lindner

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