Offset printing of security symbols on a substrate

Patent metadata

Field	Value
Publication number	US-11850878-B2
Application number	US-202217962053-A
Country	US
Kind code	B2
Filing date	Oct 7, 2022
Priority date	Oct 12, 2021
Publication date	Dec 26, 2023
Grant date	Dec 26, 2023

Abstract

A substrate is printed with front side and back side markings. The front side when viewed with reflected light includes: a first marking printed with a first gradient of two colors; a second marking printed with a second gradient of two colors; a first symbol printed with a third gradient of two colors; a second symbol printed with a fourth gradient of two colors; a third symbol printed with a fifth gradient of two colors; and a fourth symbol printed with a sixth gradient of two colors. The back side when viewed with reflected light includes: a third marking printed with the fourth gradient; a fourth marking printed with the third gradient; a fifth symbol printed with the second gradient; a sixth symbol printed with the first gradient; a seventh symbol printed with the sixth gradient; and an eighth symbol printed with the fifth gradient.

First claim

What is claimed is:

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.

2. The method of claim 1 , further comprising:
printing with an offset printing press including a first print unit, a first printing plate, and a first ink well containing an inside section and outside sections, the first print unit configured to print the front side of the substrate in a first gradient:
a first printing plate symbol; and
a second printing plate symbol;

printing with the offset printing press including a second print unit, a second printing plate, and a second ink well containing an inside section and outside sections, the second print unit configured to print the front side of the substrate in a second gradient:
a fourth printing plate symbol;

printing with the offset printing press including a third print unit, a third printing plate, and a third ink well containing an inside section and outside sections, the third print unit configured to print the front side of the substrate in a third gradient:
a sixth printing plate symbol; and
a second printing plate marking;

printing with the offset printing press including a fourth print unit, a fourth printing plate, and a fourth ink well containing an inside section and outside sections;
printing with the offset printing press including a fifth print unit, a fifth printing plate, and a fifth ink well containing an inside section and outside sections, the fifth print unit configured to print the back side of the substrate in the second gradient:
a ninth printing plate symbol; and
a fourth printing plate markings; and

printing with the offset printing press including a sixth print unit, a sixth printing plate, and a sixth ink well containing an inside section and outside sections, the sixth print unit configured to print the back side of the substrate in the third gradient:
an eleventh printing plate symbol.

3. The method of claim 2 , wherein:
the first printed substrate marking is formed by printing the front side of the substrate using the second printing plate marking;
the third printed substrate marking is formed by printing the back side of the substrate using the third printing plate marking and the fourth printing plate marking;
the first printed substrate symbol is formed by printing the front side of the substrate using the first printing plate symbol and the sixth printing plate symbol;
the second printed substrate symbol is formed by printing the front side of the substrate using the second printing plate symbol and the fourth printing plate symbol;
the fifth printed substrate symbol is formed by printing the back side of the substrate using the ninth printing plate symbol; and
the sixth printed substrate symbol is formed by printing the back side of the substrate using the eleventh printing plate symbol.

4. The method of claim 3 , wherein:
the first printed substrate marking on the front side overlaps the third printed substrate marking on the back side;
the first printed substrate symbol on the front side overlaps the fifth printed substrate symbol on the back side; and
the second printed substrate symbol on the front side overlaps the sixth printed substrate symbol the back side.

5. The method of claim 1 , further comprising:
printing the front side of the substrate with the front side of the substrate showing the front pattern which further includes:
a second printed substrate marking printed with the second reflected light gradient;
a third printed substrate symbol printed with a fifth reflected light gradient of two colors, the fifth reflected light gradient flowing from the sixth color, to the fourth color, back to the sixth color; and
a fourth printed substrate symbol printed with a sixth reflected light gradient of two colors, the sixth reflected light gradient flowing from the third color, to the second color, back to the third color; and

printing the back side of the substrate with the back side of the substrate showing the back pattern which further includes:
a fourth printed substrate marking printed with the third reflected light gradient;
a seventh printed substrate symbol printed with the sixth reflected light gradient; and
an eighth printed substrate symbol printed with the fifth 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.

6. The method of claim 5 , further comprising:
printing with an offset printing press including a first print unit, a first printing plate, and a first ink well containing an inside section and outside sections, the first print unit configured to print the front side of the substrate in a first gradient:
a first printing plate symbol; and
a second printing plate symbol;

printing with the offset printing press including a second print unit, a second printing plate, and a second ink well containing an inside section and outside sections, the second print unit configured to print the front side of the substrate in a second gradient:
a fourth printing plate symbol;

printing with the offset printing press including a fourth print unit, a fourth printing plate, and a fourth ink well containing an inside section and outside sections;
printing with the offset printing press including a third print unit, a third printing plate, and a third ink well containing an inside section and outside sections, the third print unit configured to print the front side of the substrate in a third gradient:
a sixth printing plate symbol; and
a second printing plate marking;

printing with the offset printing press including a fifth print unit, a fifth printing plate, and a fifth ink well containing an inside section and outside sections, th

Assignees

• The Government Of The Us Secretary Of Homeland Security
• The Government Of The United States Of America Represented By The Secretary Of Homeland Security

Inventors

• Zlotnick Joel
• Brough Jordan
• Eberhardt Troy
• Mcconnell Tyra
• Gil Elizabeth
• Moran Traci

Classifications

• B42D25/309

  Photographs · CPC title

• B42D25/29 Primary

  Securities; Bank notes · CPC title

• B41F1/16

  for offset printing {(pad printing B41F17/001)} · CPC title

• B41F7/025

  Multicolour printing or perfecting on sheets or on one or more webs, in one printing unit · CPC title

• B41F31/008

  Inking devices for reversible printing presses · CPC title