Method for producing improved retroreflective system for sign su

Details Method for producing improved retroreflective system for sign su Method for producing improved retroreflective system for sign su

1977-05-18

1979-04-10

Corbin, John K.

Road structure, process, or apparatus

Apparatus

Rotating drum, roller or tire

350 97, 404 14, G02B 5128

Patent

active

041485610

ABSTRACT:
A light retroreflective system essentially of the kind described in the U.S. Pat. No. 3,981,557, comprising a primary focusing transparent body having elliptical sections in planes perpendicular to a rotary symmetry axis of such body, and an equatorial zone about such axis, the system being noted by having a multilayer of complemental reflective means comprising microspheres concentrated on said equatorial zone. There also described a method for producing said system and including rotarily mixing bodies of such geometrical configuration together with an amount of microspheres less than that necessary for forming monolayers all about the entire surfaces of said bodies.

REFERENCES:
patent: 3874784 (1975-04-01), Eigenmann
patent: 3964821 (1976-06-01), Eigenmann
patent: 3981557 (1976-09-01), Eigenmann
patent: 4049337 (1977-09-01), Eigenmann

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