US 11,833,849 B2
Security ink based security feature
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 Jan. 25, 2022, as Appl. No. 17/583,404.
Application 17/583,404 is a continuation of application No. 16/422,274, filed on May 24, 2019, granted, now 11,241,901.
Application 16/422,274 is a continuation of application No. 15/830,301, filed on Dec. 4, 2017, granted, now 10,357,991, issued on Jul. 23, 2019.
Claims priority of provisional application 62/436,226, filed on Dec. 19, 2016.
Prior Publication US 2022/0143997 A1, May 12, 2022
Int. Cl. B42D 25/369 (2014.01); B41M 3/14 (2006.01); B42D 25/378 (2014.01); B42D 25/41 (2014.01); B42D 25/23 (2014.01); B42D 25/24 (2014.01); B42D 25/29 (2014.01)
CPC B42D 25/369 (2014.10) [B41M 3/148 (2013.01); B42D 25/378 (2014.10); B42D 25/41 (2014.10); B42D 25/23 (2014.10); B42D 25/24 (2014.10); B42D 25/29 (2014.10)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
exposing a security article to a first magnetic field to magnetically orient a first set of particles of a first ink layer;
curing the first ink layer to fix an orientation of the first set of particles; and
exposing, after curing the first ink layer to fix an orientation of the first set of particles, the security article to a second magnetic field to magnetically orient a second set of particles of a second ink layer,
wherein a first color-shifting property of the first ink layer is configured to shift from a first color of the first ink layer to a second color of the first ink layer,
wherein a second color-shifting property of the second ink layer is configured to shift from a first color of the second ink layer to a second color of the second ink layer,
wherein the first color of the first ink layer is within at least 10 deltaE on a pigment measurement scale to the first color of the second ink layer,
wherein the second color of the first ink layer is within at least 10 deltaE on the pigment measurement scale to the second color of the second ink layer, and
wherein the first color-shifting property and the second color-shifting property are configured to create a color matching effect.