US 12,275,267 B2
Security pigment and optical security element
Paul Thomas Kohlmann, Windsor, CA (US); Vladimir P. Raksha, Santa Rosa, CA (US); and Cornelis Jan Delst, Fairfax, CA (US)
Assigned to VIAVI SOLUTIONS INC., Chandler, AZ (US)
Filed by VIAVI SOLUTIONS INC., San Jose, CA (US)
Filed on Oct. 8, 2020, as Appl. No. 17/066,182.
Claims priority of provisional application 62/912,518, filed on Oct. 8, 2019.
Prior Publication US 2021/0101402 A1, Apr. 8, 2021
Int. Cl. B42D 25/369 (2014.01); B42D 25/373 (2014.01)
CPC B42D 25/369 (2014.10) [B42D 25/373 (2014.10)] 19 Claims
OG exemplary drawing
 
1. An article comprising:
a substrate with a transparent window; and
a first composition on the transparent window, the first composition including a cured liquid medium, and a semi-transparent magnetic pigment, wherein the semi-transparent magnetic pigment includes a semi-transparent, metallic magnetic material and a light interference cavity that includes a dielectric material, wherein the dielectric material of the semi-transparent magnetic pigment is present in multiple layers,
the semi-transparent, metallic magnetic material being located at a center of the semi-transparent magnetic pigment,
wherein the semi-transparent, metallic magnetic material is a semi-transparent thin layer or a particle in a layer, and wherein and a first layer of the multiple layers of the dielectric material is directly adjacent to one side of the semi-transparent, metallic magnetic material and a second layer of the multiple layers of the dielectric material is directly adjacent to an opposite side of the semi-transparent, metallic magnetic material.