Light reflector plate and method of fabrication

Details Light reflector plate and method of fabrication Light reflector plate and method of fabrication

1972-04-18

1976-08-10

Pitrelli, John F.

Card, picture, or sign exhibiting

Display card

Having a curved display panel

40125N, G09F 1316

Patent

active

039733424

ABSTRACT:
A reflector plate including a transparent or at least translucent synthetic plastic body with a back surface having a multiplicity of evenly distributed, integral, optically precisely formed triangular pyramids or like prisms as reflecting element formations and covered with a reflective metallic layer, for example, silver, aluminum, copper, chromium or nickel, has front surface differentiation for symbols such as letters or numbers provided by impressing to indent or raise surface portions, or material application. An auto license plate, not alterable without ready detection, is a particularly advantageous disclosed use. A method of fabrication including injection molding, casting molding, or hot or cold forming of a plastic body with the back-reflecting prism formations with steps for applying or incorporating the symbols, and certain apparatus therefor are outlined.

REFERENCES:
patent: 1688196 (1928-10-01), Masson
patent: 1846173 (1932-02-01), Willweischeid
patent: 1856462 (1932-05-01), Burns
patent: 1858975 (1932-05-01), Ta'Bois
patent: 1990224 (1935-02-01), Cochran
patent: 2003126 (1935-05-01), Torstenson
patent: 2016333 (1935-10-01), Leeds
patent: 2037773 (1936-04-01), Eynon
patent: 2193057 (1940-03-01), Carver
patent: 2294930 (1942-09-01), Palmquist
patent: 3096596 (1963-07-01), Magnuson et al.
patent: 3632695 (1972-01-01), Howell

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