Security Device Using Reversibly Self-Assembling Systems

• US 20080075668A1
• Filed: 09/27/2006
• Published: 03/27/2008
• Est. Priority Date: 09/27/2006
• Status: Abandoned Application

• Current Assignee: Samsid Technologies LLC
• Original Assignee: Samsid Technologies LLC
• Inventors: Goldstein, Alan H.
• Application Number:
  US11/535,875
• Publication Number:
  US 20080075668A1
• Time in Patent Office: Days
• US Class Current: 424/9.6
• CPC Class Codes: B42D 2033/42 with separable mating or co-operating elements
• CPC Class Codes: B42D 25/00 Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof printing processes to produce identification or security features B41M3/14
• CPC Class Codes: B42D 25/21 for multiple purposes
• CPC Class Codes: B42D 25/29 Securities; Bank notes
• CPC Class Codes: B42D 25/45 Associating two or more layers
• CPC Class Codes: G07D 7/003 using security elements using digital security elements G07D7/004
• 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 security device having: a base having a pattern thereon; a mobile component disposed in contact with the base, the mobile component containing a plurality of reversibly adsorbable particles; and a cover attached to the base around the mobile component to maintain the mobile component in contact with the base; wherein the adsorbable particles are mobile and reversibly changeable between a first state where the adsorbable particles are adsorbed to at least a predetermined percentage of the pattern and a second state where the adsorbable particles are adsorbed to less than the predetermined percentage of the pattern.

Claims

1. A security device comprising:

a base having a pattern thereon;

a mobile component disposed in contact with the base, the mobile component containing a plurality of reversibly adsorbable particles; and

a cover attached to the base around the mobile component to contain the mobile component in contact with the base;

wherein the adsorbable particles are mobile and reversibly changeable between a first state where the adsorbable particles are adsorbed to at least a predetermined percentage of the pattern and a second state where the adsorbable particles are adsorbed to less than the predetermined percentage of the pattern.

2. The security device of claim 1 wherein when the adsorbable particles are in the first state, the pattern is visible to an unaided human eye.

3. The security device of claim 2 wherein the base further comprises a second pattern that is not visible to an unaided human eye when the adsorbable particles are in the first state.

4. The security device of claim 2 wherein the base further comprises a second pattern that is not visible to an unaided human eye.

5. The security device of claim 2 wherein the adsorbable particles comprise a dye.

6. The security device of claim 2 wherein the base further comprises:

a protective layer; and

a substrate attached to the protective layer, the pattern being formed on the substrate.

7. The security device of claim 6 wherein the protective layer comprises at least one of the group consisting of silicone rubber and silicone elastomer.

8. The security device of claim 7 wherein the cover further comprises at least one of the group consisting of a polyimide film and a fluoropolymer film.

9. The security device of claim 1 wherein:

the pattern is not visible to an unaided human eye when the adsorbable particles are in the first state; and

the pattern is visible to an unaided human eye when the adsorbable particles are in the second state.

10. The security device of claim 1 wherein the adsorbable particles change from the first state to the second state and back to the first state in less than 5 seconds.

11. The security device of claim 1 wherein the device is operable in a temperature range of from about −

20 degrees Celsius to about 70 degrees Celsius.

12. The security device of claim 1 wherein the adsorbable particles can cycle from the first state to the second state and back to the first state more than 10,000 times.

13. The security device of claim 1 wherein the base comprises a lip around an outer edge;

and the cover is attached to the lip.

14. A method for making a security device comprising:

forming a base with a pattern;

coupling the base to a cover;

injecting a mobile component between the base and the pattern through the cover, the mobile component comprising a plurality of adsorbable particles; and

sealing the cover;

wherein the adsorbable particles are mobile and reversibly changeable between a first state where the adsorbable particles are adsorbed to at least a predetermined percentage of the pattern and a second state where the adsorbable particles are adsorbed to less than the predetermined percentage the pattern.

15. The method of claim 14 wherein forming a base comprises:

depositing a pattern material on a substrate in a pattern; and

attaching the substrate to a protective layer.