US 10,176,658 B2Granted

Magnetic watermarking of a printed substrate by metameric rendering

AssigneeXerox Corporation

InventorsReiner Eschbach, Martin S. Maltz, Raja Bala, Yonghui Zhao

Life of this patent

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Abstract

A document may include a non-magnetic substrate, a first colorant mixture printed as a first image upon the substrate, the first colorant mixture including a magnetic ink, and a second colorant mixture printed as a second image upon the substrate in substantially close spatial proximity to the printed first colorant mixture. The second colorant mixture may consist essentially of one or more non-magnetic inks and exhibit properties of both low visual contrast and high magnetic contrast against the first colorant mixture, such that the resultant printed substrate does not reveal the first image to the human eye, but will reveal the first image to a magnetic image reader.

Claims20

Dependent claims

A method of printing a mark on a substrate, comprising, by a digital color printing system:

printing a first colorant mixture onto a substrate as a first repeating distraction pattern, wherein:
the first colorant mixture comprises a first colorant and a second colorant, at least one of which comprises a magnetic ink, and
the first repeating distraction pattern comprises the first colorant printed in mosaic combination with the second colorant;
and
printing a second colorant mixture onto the substrate as a second repeating distraction pattern, wherein:
the second colorant mixture comprises a third colorant and a fourth colorant, at least one of which comprises a non-magnetic ink,
the second colorant mixture exhibits properties of both low visual contrast and high magnetic contrast with respect to the first colorant mixture, and
the second repeating distraction pattern comprises the third colorant printed in mosaic combination with the fourth colorant;
wherein:
the printing steps print the first and second repeating distraction patterns in substantially close spatial proximity to each other,
the first repeating distraction pattern is not visible to the human eye, and
the first repeating distraction pattern is detectable by a magnetic sensitive device.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/873,213Filed 17 Jan 2018 · continuation
Priority: 25 Aug 2009
Published: US 2018/0144572 A124 May 2018
Granted: 8 Jan 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G07D 7/0034
Using security elements: using watermarks
G07D 7/005
Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g.…:…
Y10T 428/24835
Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]: including developable image or…
G07D
Handling of coins or valuable papers

Family

Application12/546,848Parent of this continuation · filed 25 Aug 2009
US 2018/0144572 A1Pre-grant publication · published 24 May 2018
US 9,892,585 B2Parent of this continuation
US 2011/0052888 A1Published application
US 10,176,658 B2This patent

From the US filing history. Foreign family members aren’t listed.