1
Donald E Van Arnam: Method for forming retroreflective sheeting. Avery International Corporation, Christie Parker & Hale, January 6, 1981: US04243618 (171 worldwide citation)

A method is disclosed for forming a retroreflective sheeting having a plurality of retroreflective cube-corner prisms distributed over one of its surfaces such that the prisms are disposed in a planar array having a plurality of zones of prisms having differing angular orientations such that the zon ...


2
Donald E Van Arnam, Earl W McFeaters, Richard R Baggarley: Retroreflectometer. Avery International Corporation, Christie Parker & Hale, January 18, 1983: US04368982 (14 worldwide citation)

Apparatus and methods for measuring retroreflective properties of a surface are disclosed. The apparatus and methods are characterized in that the measured angle of divergence is varied while the angle of incidence is simultaneously varied.