Fluorescent security thermal transfer printing ribbon

• US 5,935,694 A
• Filed: 07/16/1997
• Issued: 08/10/1999
• Est. Priority Date: 07/15/1993
• Status: Expired due to Term

• Current Assignee: NCR Corporation
• Original Assignee: NCR Corporation
• Inventors: Roth, Joseph D., Olmstead, Michael W., Puckett, Richard D.
• Primary Examiner(s): Schwartz, Pamela R.
• Application Number:
  US08/895,338
• Time in Patent Office: 755 Days
• Field of Search: 428/195, 428/201, 428/690, 428/202, 428/204, 428/212, 428/484, 428/488.4, 428/913, 428/914
• US Class Current: 428/32.69
• CPC Class Codes: B41J 31/00 Ink ribbons; Renovating or testing ink ribbons
• CPC Class Codes: B41M 3/144 using fluorescent, luminescent or iridescent effects
• CPC Class Codes: B41M 5/38228 characterised by the use of two or more ink layers
• CPC Class Codes: B41M 5/385 characterised by the transferable dyes or pigments infrared absorbing dyes B41M5/465
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10S 428/914 Transfer or decalcomania
• CPC Class Codes: Y10T 428/24851 Intermediate layer is discontinuous or differential
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31931 Polyene monomer-containing

Abstract

Fluorescent security thermal transfer printing ribbons consisting of an elongated backing element having a printing media adhered to one side thereof. The printing media is capable of being transferred to paper, or some other print receiving medium, by conventional thermal transfer printing equipment. The thermally transferred printing media includes an interspersed distribution of fluorescent pigments, resulting in printed security characters and images which are transparent or invisible under broad spectrum light, but which fluoresce, and become visible, when exposed to black light.

Claims

1. A fluorescent security thermal transfer printing ribbon for printing a printed image having security characters or indicia, said fluorescent security thermal transfer printing ribbon comprising:

a backing element having a top surface;

a first printing media layer adhered to said top surface of said backing element, said first printing media layer having an interspersed distribution of fluorescent pigments and a top surface, said fluorescent pigments are transparent under broad spectrum light; and

a second printing media layer adhered to said top surface of said first printing media layer so that substantially the entire top surface of said backing element is covered by said second printing media layer, said second printing media layer having an interspersed distribution of visible black or colored pigments;

wherein said first printing media layer forms the printed image security characters or indicia and said second printing media layer forms the printed image visible under broad spectrum light.

2. The fluorescent security thermal transfer printing ribbon in accordance with claim 1, wherein said first printing media layer is spot coated on said top surface of said backing element in a predetermined pattern to cover a portion, but not all, of said top surface of said backing element.

3. The fluorescent security thermal transfer printing ribbon in accordance with claim 2, wherein:

said fluorescent security thermal transfer printing ribbon includes a third spot coated printing media layer adhered to said top surface of said backing element, said third spot coated printing media layer having an interspersed distribution of fluorescent pigments and a top surface; and

said second printing media layer is adhered to said top surface of said first printing media layer and said top surface of said third spot coated printing media layer.

4. The fluorescent security thermal transfer printing ribbon in accordance with claim 3, wherein said fluorescent pigments in said first printing media layer are of a different color than said fluorescent pigments in said third printing media layer.

5. The fluorescent security thermal transfer printing ribbon in accordance with claim 3, wherein said fluorescent pigments in said first printing media layer are of a different concentration than said fluorescent pigments in said third printing media layer.

6. The fluorescent security thermal transfer printing ribbon in accordance with claim 3, wherein said third printing media layer overlaps a portion of said first printing media layer.

7. The fluorescent security thermal transfer printing ribbon in accordance with claim 2, wherein said predetermined pattern is a repeating pattern.

8. A fluorescent security thermal transfer printing ribbon for printing a printed image having security characters or indicia, said fluorescent security thermal transfer printing ribbon comprising:

a backing element having a top surface;

a first printing media layer adhered to said top surface of said backing element, said first printing media layer having an interspersed distribution of fluorescent pigments, a top surface and being spot coated on said top surface of said backing element in a predetermined pattern to cover a portion, but not all, of said top surface of said backing element, said fluorescent pigments are transparent under broad spectrum light; and

a second printing media layer adhered to said top surface of said first printing media layer and to said backing element on portions not covered by said first printing media layer, said second printing media layer having an interspersed distribution of visible black or colored pigments;

wherein said first printing media layer forms the printed image security characters or indicia and said second printing media layer forms the printed image visible under broad spectrum light.