Polymeric radio frequency resonant tags and method for manufacture

• US 6,031,458 A
• Filed: 08/07/1998
• Issued: 02/29/2000
• Est. Priority Date: 08/08/1997
• Status: Expired due to Fees

• Current Assignee: SCA Coordination Center NV (Industrivärden AB)
• Original Assignee: IRD Incorporated
• Inventors: Jacobsen, Soren, Lundsgaard, Jorgen Schjerning, Thomas, David Morgan, Engell, John
• Primary Examiner(s): TONG, NINA C
• Application Number:
  US09/131,105
• Time in Patent Office: 571 Days
• Field of Search: 340/572.1, 340/572.3, 340/572.4, 340/572.5, 340/572.6, 340/571, 340/568.1, 343/873, 343/872, 343/895
• US Class Current: 340/572.5
• CPC Class Codes: B32B 2519/02 RFID tags
• CPC Class Codes: G08B 13/2414 using inductive tags
• CPC Class Codes: G08B 13/2437 Tag layered structure, processes for making layered tags
• CPC Class Codes: G08B 13/2445 Tag integrated into item to be protected, e.g. source tagging

Abstract

The present invention provides polymeric radio frequency resonant tags and methods of manufacturing these tags for use in detection of theft of article for sale.

Claims

1. A polymeric radio frequency resonant tag comprising:

a) a first conductive pattern connected to a first capacitor electrode applied to a substrate;

b) a dielectric film applied to said first conductive pattern and first capacitor electrode; and

c) a second conductive pattern connected to a second capacitor electrode applied to said dielectric film;

wherein said first and second conductive patterns are connected to form an inductive element.

2. The polymeric radio frequency resonant tag of claim 1 further comprising an insulation layer located between said first conductive pattern connected to said first capacitor electrode and the substrate.

3. The polymeric radio frequency resonant tag of claim 1 further comprising a covering layer applied to said second conductive pattern and said second capacitor electrode.

4. The polymeric radio frequency resonant tag of claim 1 further comprising a fusible link constriction in the first conductive pattern or the second conductive pattern so that the polymeric radio frequency resonant tag can be deactivated by applying an electromagnetic field at a resonant frequency to the fusible link constriction.

5. A polymeric radio frequency resonant tag comprising:

a) a first conductive pattern connected to a first capacitor electrode applied to a substrate;

b) a capacitor composite applied to said first capacitor electrode;

c) a dielectric film applied to said first conductive pattern and located adjacent to said capacitor composite; and

c) a second conductive pattern connected to a second capacitor electrode applied to the capacitor composite and dielectric composite;

wherein the first and second conductive patterns are connected to form an inductive element.

6. The polymeric radio frequency resonant tag of claim 5 further comprising an insulation layer located between said first conductive pattern and first capacitor electrode and the substrate.

7. The polymeric radio frequency resonant tag of claim 5 further comprising a covering layer applied to said second conductive pattern and second capacitor electrode.

8. The polymeric radio frequency resonant tag of claim 5 further comprising a fusible link constriction in the first conductive pattern or the second conductive pattern so that the polymeric radio frequency resonant tag can be deactivated by applying an electromagnetic field at a resonant frequency to the fusible link constriction.

9. A method of manufacturing a polymeric radio frequency resonant tag comprising:

a) applying a first conductive pattern layer connected to a first capacitor electrode onto a substrate;

b) applying a dielectric film layer onto said first conductive pattern layer and first capacitor electrode;

c) applying a second conductive pattern layer connected to a second capacitor electrode onto the dielectric film so that the first conductive pattern and the second conductive pattern link to form an inductive element; and

d) cross linking or bonding said layers and substrate to form a polymeric radio frequency resonant tag.

10. The method of claim 9 further comprising applying an insulation layer between said first conductive pattern layer and first capacitor electrode and the substrate.

11. The method of claim 9 further comprising concealing the tag on the substrate to protect the inductive element.

12. A method of manufacturing a polymeric radio frequency resonant tag comprising:

a) applying a first conductive pattern layer connected to a first capacitor electrode onto a substrate;

b) applying a capacitor composite layer onto said first capacitor electrode;

c) applying a dielectric film layer onto said first conductive pattern layer adjacent to said capacitor composite layer;

c) applying a second conductive pattern layer connected to a second capacitor electrode onto said capacitor composite and dielectric film layers so that said first conductive pattern and said second conductive pattern form an inductive element; and

d) cross linking or bonding said layers and substrate to form a polymeric radio frequency resonant tag.

13. The method of claim 12 further comprising applying an insulation layer between said first conductive pattern layer and the substrate.

14. The method of claim 12 further comprising concealing the tag on the substrate to protect the inductive element.