US 11,850,878 B2
Offset printing of security symbols on a substrate
Joel Zlotnick, Arlington, VA (US); Jordan Brough, Leesburg, VA (US); Troy Eberhardt, Centreville, VA (US); Tyra McConnell, Knoxville, MD (US); Elizabeth Gil, Bristow, VA (US); and Traci Moran, Rockville, MD (US)
Assigned to The Government of the United States of America, represented by the Secretary of Homeland Security, Washington, DC (US)
Filed by The Government of the United States of America, as represented by the Secretary of Homeland Security, Washington, DC (US)
Filed on Oct. 7, 2022, as Appl. No. 17/962,053.
Claims priority of provisional application 63/287,754, filed on Dec. 9, 2021.
Claims priority of provisional application 63/254,799, filed on Oct. 12, 2021.
Prior Publication US 2023/0113148 A1, Apr. 13, 2023
Int. Cl. B42D 25/29 (2014.01); B41M 3/14 (2006.01); B41M 1/10 (2006.01); B42D 25/405 (2014.01); B42D 25/342 (2014.01); B42D 25/378 (2014.01); B41F 1/16 (2006.01); B41F 31/00 (2006.01); B41M 1/14 (2006.01); B41F 7/02 (2006.01); B42D 25/333 (2014.01)
CPC B42D 25/29 (2014.10) [B41F 1/16 (2013.01); B41F 7/025 (2013.01); B41F 31/008 (2013.01); B41M 1/14 (2013.01); B41M 3/14 (2013.01); B41M 3/148 (2013.01); B42D 25/342 (2014.10); B42D 25/378 (2014.10); B42D 25/405 (2014.10); B41M 2205/34 (2013.01); B41P 2227/10 (2013.01); B42D 25/333 (2014.10)] 21 Claims
OG exemplary drawing
 
1. A method of printing anti-counterfeit markings on a substrate having front side markings on a front side and back side markings on a back side, the method comprising:
printing the front side of the substrate with the front side of the substrate showing a front pattern of reflected symbols and marking when viewed with reflected light, the front pattern containing:
a first printed substrate marking printed with a first reflected light gradient of two colors, the first reflected light gradient flowing from a first color, to a second color, back to the first color;
a first printed substrate symbol printed with a third reflected light gradient of two colors, the third reflected light gradient flowing from a fourth color, to a fifth color, back to the fourth color; and
a second printed substrate symbol printed with a fourth reflected light gradient flowing from the fifth color, to a sixth color, back to the fifth color; and
printing the back side of the substrate with the back side of the substrate showing a back pattern of reflected symbols and markings when viewed with reflected light, the back pattern containing:
a third printed substrate marking printed with the fourth reflected light gradient;
a fifth printed substrate symbol printed with a second reflected light gradient of two colors, the second reflected light gradient flowing from a third color, to the first color, back to the third color; and
a sixth printed substrate symbol printed with the first reflected light gradient;
the first color, the second color, the third color, the fourth color, the fifth color, and the sixth color being selected, when viewed from the front side with transmitted light, to be subtractive between the front side and the back side, to show all symbols and markings in black color by incorporating complementary colors between the front side and the back side.