Method for authenticating packages using magnetophoretic imaging films

Patent metadata

Field	Value
Publication number	US-10649247-B2
Application number	US-201916562789-A
Country	US
Kind code	B2
Filing date	Sep 6, 2019
Priority date	Mar 25, 2014
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

The present invention is directed to a method for authenticating a package using a magnetophoretic imaging film. It provides a low-cost method for verifying the authenticity of products in a way that is not immediately evident to counterfeiters. A single pre-patterned magnetic image can be used to display images on any number of individual imaging films.

First claim

What is claimed is:

1. A method for authenticating a package comprising:
a) providing a package comprising a pre-generated magnetic pattern;
b) providing a magnetophoretic imaging film, the magnetophoretic imaging film comprising a substrate and a plurality of microcells or microcapsules contacting the substrate, the microcells or microcapsules containing a fluid having a viscosity of at least 50 cps, non-magnetic particles, and magnetic particles;
c) bringing the magnetophoretic imaging film in proximity to the pre-generated magnetic pattern; and
d) allowing a semi-permanent image of the pre-generated magnetic pattern to appear on the magnetophoretic imaging film.

2. The method of claim 1 , wherein the image of the pre-generated magnetic pattern remains on the magnetophoretic imaging film after the magnetophoretic imaging film is moved away from the pre-generated magnetic pattern.

3. The method of claim 1 , wherein the image of the pre-generated magnetic pattern disappears from the magnetophoretic imaging film after the magnetophoretic imaging film is moved away from the pre-generated magnetic pattern.

4. The method of claim 1 , wherein the magnetic particles comprise magnetic metals or alloys.

5. The method of claim 4 , wherein the magnetic particles are black.

6. The method of claim 4 , wherein the magnetic particles comprise ferric oxides.

7. The method of claim 1 , wherein the non-magnetic particles are white.

8. The method of claim 1 , wherein the fluid comprises polymers and a solvent.

9. The method of claim 1 , wherein an image of the pre-generated magnetic pattern is not visible on the package without the magnetophoretic imaging film.

10. The method of claim 1 , wherein the fluid further comprises a rheology modifier having a molecular weight greater than 250 kDa.

Assignees

• E Ink California Llc

Inventors

• Laxton Peter B

Classifications

• B42D25/369

  Magnetised or magnetisable materials · CPC title

• G02F1/09 Primary

  based on magneto-optical elements, e.g. exhibiting Faraday effect · CPC title

• G02F2001/094

  Physics · mapped topic

• G02F1/094

  based on magnetophoretic effect · CPC title