Antifalsification paper provided with applied coding consisting of luminescent mottled fibers

• US 6,974,623 B2
• Filed: 12/20/2000
• Issued: 12/13/2005
• Est. Priority Date: 12/23/1999
• Status: Expired due to Term

• Current Assignee: Giesecke & Devrient (Giesecke & Devrient GmbH)
• Original Assignee: Giesecke & Devrient GmbH
• Inventors: Schwenk, Gerhard
• Primary Examiner(s): Gray, Jill M.
• Application Number:
  US10/149,425
• Publication Number:
  US 20030104176A1
• Time in Patent Office: 1,819 Days
• Field of Search: 428/195, 428/199, 428/916, 162/110, 162/140, 162/141, 283/72, 283/92, 283/113
• US Class Current: 428/199
• CPC Class Codes: D21H 21/48 Elements suited for physical verification, e.g. by irradiation
• CPC Class Codes: Y10S 428/916 Fraud or tamper detecting
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/24835 including developable image or soluble portion in coating or impregnation [e.g., safety paper, etc.]
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree

Abstract

The invention relates to a security paper with at least two types of mottled fibers, which differ in terms of their luminescent characteristics and form a code. In each case one type of mottled fibers is present in a defined subarea of the security paper, and the code is represented by the defined geometric arrangement of the subareas on the security paper and/or by the presence or absence of mottled fibers of a specific type.

Claims

1. Security paper comprising at least two types of mottled fibres with mutually different luminescent characteristics;

wherein the security paper has at least two non-overlapping subareas in which there is only one specific type of mottled fibres, respectively, the type of mottled fibers being specific for the respective subarea;

wherein an information is equally coded by a geometric arrangement of the subareas and the presence of the types of mottled fibres.

2. Security paper according to claim 1, wherein the mottled fibres contain luminescent substances with characteristic luminescent characteristics.

3. Security paper according to claim 2, wherein the luminescent substances have a spectrally narrow emission band.

4. Security paper according to claim 2, wherein the luminescent substances emit outside the visual spectral range.

5. Security paper according to claim 2, wherein the luminescent substances comprise optical intensifying materials which comprise an optically pumpable, light-emitting material, light-scattering centers and a transparent matrix material.

6. Security paper according to claim 2, wherein the luminescent substances are present in the volume of the mottled fibres.

7. Security paper according to claim 2, wherein the mottled fibres are dyed with the luminescent substances.

8. Security paper according to claim 1, wherein the mottled fibres comprise a plastic material.

9. Security paper according to claim 1, wherein the mottled fibres have been introduced into the security paper during the paper manufacture.

10. Security paper according to claim 1, wherein the mottled fibres have been introduced into the security paper by means of the Wilcox process.

11. Security paper according to claim 1, wherein the geometric arranged subareas are in the form of strips.

12. Security paper according to claim 11, wherein the width of each strip lies in the range from 5 mm to 30 mm.

13. Security paper according to claim 1, wherein the mottled fibre density in the subareas lies in the range of 2 to 20 mottled fibres per square centimeter.