公开(公告)号：US20190163980A1

公开(公告)日：2019-05-30

申请号：US16097652

申请日：2017-05-12

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Justin M. JOHNSON ,  James W. HOWARD ,  James B. SNYDER ,  Kui CHEN-HO ,  Suman K. PATEL ,  Travis L. POTTS ,  Carla H. BARNES ,  Tadesse G. NIGATU

IPC: G06K9/00 ,  G08G1/017

Abstract: In some examples, an optically active article includes a retroreflective substrate; and at least one security element disposed at the retroreflective substrate; an article message disposed at the retroreflective substrate, and wherein the at least one security element comprises validation information that is detectable outside a visible light spectrum, and wherein a combination of the article message and the validation information of the at least one security element indicates whether the optically active article is counterfeit.

公开(公告)号：US20200348458A1

公开(公告)日：2020-11-05

申请号：US16957911

申请日：2018-12-27

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： David J. LAMB ,  Guanglei DU ,  Scotty A. KOPP ,  Suman K. PATEL ,  John A. WHEATLEY

IPC: G02B5/20 ,  G02B5/124 ,  G01S7/481 ,  G01S17/02

Abstract: A retroreflective article comprises (a) a retroreflective layer including a structured surface that is opposite a major surface, (b) a pressure sensitive adhesive that contacts at least a portion of the structured surface to form an optically inactive area that does not substantially retroreflect incident light and (c) at least one low refractive index layer forming an optically active area that retroreflects incident light; wherein the optically active area comprises about 25% or less of the structured surface.