Printed security mark

• US 8,651,390 B2
• Filed: 05/25/2011
• Issued: 02/18/2014
• Est. Priority Date: 05/09/2007
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Hinch, Garry Dale, Etheridge, Herbert T. III, Stasiak, James William, Strecker, Timothy Dean
• Primary Examiner(s): Labaze, Edwyn
• Application Number:
  US13/115,860
• Publication Number:
  US 20110226954A1
• Time in Patent Office: 1,000 Days
• Field of Search: 235/454, 235/494, 235/375, 235/487, 235/491
• US Class Current: 235/494
• CPC Class Codes: C09D 11/36 based on non-aqueous solvents
• CPC Class Codes: C09D 11/50 Sympathetic, colour changing or similar inks
• CPC Class Codes: G06K 2019/06225 using wavelength selection, e.g. colour code

Abstract

Embodiments of a printed security mark and a process are disclosed.

Claims

1. A method of reading a security mark, comprising:

emitting a light in a non-visible wavelength range onto a security mark to activate a light activated component of the security mark, the light activated component defining a spectral property that is a wavelength specific feature chosen from an absorptive feature and a Raman feature, and the light activated component being chosen from a nanocrystal, a quantum dot, and a carbon nanotube;

detecting a light-activated response from the light activated component; and

comparing the light-activated response with a security pattern stored in a memory.

2. The method as defined in claim 1 wherein the light is chosen from ultraviolet light and infrared light.

3. The method as defined in claim 1 wherein the detecting is conducted with a spectroscopic device.

4. The method as defined in claim 1 wherein the comparing includes utilizing a computer algorithm to compare a pre-established reference wavelength peak pattern in the memory with a wavelength peak response pattern of the light-activated response.

5. A method of reading a security mark, comprising:

emitting a light in a non-visible wavelength range onto a security mark to activate a light activated component of the security mark, the light activated component defining a spectral property that is a wavelength specific feature chosen from an absorptive feature and a Raman feature;

detecting a light-activated response from the light activated component; and

comparing the light-activated response with a security pattern stored in a memory, the comparing including utilizing a computer algorithm to compare a pre-established reference wavelength peak pattern in the memory with a wavelength peak response pattern of the light-activated response;

wherein;

the wavelength peak standard pattern includes a plurality of standard peaks each having a standard peak position and a standard peak amplitude;

the wavelength peak response pattern of the light-activated response includes a plurality of response peaks each having a response peak position and a response peak amplitude; and

a position of each of the response peak positions and an amplitude of each of the response peak amplitudes is compared with a position of the standard peak positions and an amplitude of the stand peak amplitudes, respectfully, for responding ones of the standard peaks.

6. The method as defined in claim 5 wherein the response pattern is determined to match the standard pattern when each of the response peak positions matches a corresponding standard peak position to within ten percent of a value of the standard peak position, and when each of the response peak amplitudes matches a corresponding standard peak amplitude to within ten percent of a value of the standard peak amplitude.

7. The method as defined in claim 5 wherein the light is chosen from ultraviolet light and infrared light.

8. The method as defined in claim 5 wherein the detecting is conducted with a spectroscopic device.