Product authentication system and method

• US 6,536,672 B1
• Filed: 04/14/1999
• Issued: 03/25/2003
• Est. Priority Date: 11/18/1998
• Status: Active Grant

• Current Assignee: Polestar LTD
• Original Assignee: DNA Technologies Incorporated
• Inventors: Outwater, Chris
• Primary Examiner(s): Le, Thien M.
• Assistant Examiner(s): FRANKLIN, JAMARA ALZAIDA
• Application Number:
  US09/291,365
• Time in Patent Office: 1,441 Days
• Field of Search: 235/487, 235/491, 235/468, 235/494, 235/462.01, 235/462.04, 235/469, 283/88, 283/89
• US Class Current: 235/491
• CPC Class Codes: G09F 3/0294 where the change is not permanent, e.g. labels only readable under a special light, temperature indicating labels and the like

Abstract

A product authentication system and method employs a unique mark that is simple and cost-effective to apply, but provides several layers of protection, including anti-counterfeit and anti-diversion, against counterfeiters. The unique mark contains a product control code that is printed in invisible ink comprising a UV ink and an IR ink. The first layer of protection is invisibility. The second layer of protection is the code itself. The third layer of protection is the presence of the IR ink in the invisible code. The fourth layer of protection is the IR emitting characteristics of the invisible code.

Claims

1. A product label comprising a code applied thereon, wherein the code is invisible under visible light and includes a UV ink to render the code visible and decipherable under UV light and an IR ink to render a part of the code to be visible under concentrated IR light said IR ink made visible by up-converting phosphor contained therein.

2. The product label according to claim 1, further comprising a polyester substrate, wherein the code is applied on the polyester substrate.

3. The product label according to claim 2, wherein the code is hot stamped onto the polyester substrate.

4. The product label according to claim 1, wherein the code comprises alphanumeric characters representing a product control code.

5. The product label according to claim 4, wherein the UV ink and the IR ink are contained in the product control code.

9. The authentication mark according to claim 1, wherein the product label comprises the polyester.

10. The authentication mark according to claim 9, wherein the code is applied to the product label using a hot stamping process.

6. An authentication mark placed on a substrate comprising a code that is invisible under visible light, said code including a UV portion that is visible and decipherable when illuminated with UV light and an IR portion that is visible when illuminated with concentrated IR light said IR portion produced by IR ink containing up-converting phosphor, wherein positions of the UV and IR portions have been predefined relative to each other, and said substrate comprises a product label.

7. The authentication mark according to claim 6, wherein the UV and IR portions overlay one another.

8. The authentication mark according to claim 7, wherein the code comprises alphanumeric characters representing a product control code.

11. A method of verifying an authenticity of a product, comprising the steps of:

exposing the product under a UV light source;

locating at least a portion of a code that is visible and decipherable under the UV light source said code having an IR portion, said IR portion produced by IR ink containing up-converting phosphor;

exposing IR portion of the code to a concentrated IR light; and

confirming a light emission in response to the concentrated IR light.

12. The method according to claim 11, further comprising the step of confirming a color of the light emission.

13. The method according to claim 11, further comprising the step of confirming that the code is a valid code.

14. The method according to claim 13, wherein the step of confirming that the code is valid includes the step of matching the product destination with a country code contained in the code.

15. The method according to claim 11, further comprising the step of aiming the IR light in a predetermined relation to the location of the portion of the code.

16. The method according to claim 11, wherein the IR light is aimed at the location of the portion of the code.

17. The method according to claim 15, wherein the code comprises alphanumeric characters and the IR light is aimed at a space between two of the alphanumeric characters.

18. A product label comprising a mark applied thereon using ink containing a down-converting phosphor and an up-converting phosphor, wherein the mark is not visible when illuminated under visible light, and at least a portion of the mark is visible when exposed to a diffuse UV light source and wherein an amount of the up-converting phosphor is controlled so that another portion of the mark is visible when illuminated under a concentrated IR light source but is not visible under a diffuse IR light source.

19. The product label according to claim 18, wherein a ratio of the down-converting phosphor to the up-converting phosphor is about 7:

3 by weight.

20. The product label according to claim 19, wherein the down-converting phosphor and the up-converting phosphor comprise 10-20% of the ink by weight.