Processing

Please wait...

Settings

Settings

1. WO1999017260 - ANTI-COUNTERFEITING AND DIFFUSIVE SCREENS

Publication Number WO/1999/017260
Publication Date 08.04.1999
International Application No. PCT/GB1998/002936
International Filing Date 30.09.1998
Chapter 2 Demand Filed 17.02.1999
IPC
G PHYSICS
07
CHECKING-DEVICES
D
HANDLING OF COINS OR OF PAPER CURRENCY OR SIMILAR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
7
Testing specially adapted to determine the identity or genuineness of paper currency or similar valuable papers, e.g. for segregating those which are unacceptable or alien to a currency
06
using wave or particle radiation
12
Visible light, infra-red or ultra-violet radiation
G07D 7/12 (2006.01)
CPC
G07D 7/0043
G07D 7/12
Applicants
  • DURAND LIMITED [--/--]; P.O. Box 118 St. Peter Port Guernsey GY1 3HA, GB (AllExceptUS)
  • JOHNSON, William, Nevil, Heaton [--/--]; GB (AllExceptUS)
  • PHILLIPS, Nicholas, John [GB/GB]; GB (UsOnly)
  • BLACKLEDGE, Jonathan, Michael [GB/GB]; GB (UsOnly)
Inventors
  • PHILLIPS, Nicholas, John; GB
  • BLACKLEDGE, Jonathan, Michael; GB
Agents
  • HOWDEN, Christopher, A.; Forrester Ketley & Co. Forrester House 52 Bounds Green Road London N11 2EY, GB
Priority Data
9720741.930.09.1997GB
9807483.407.04.1998GB
9817057.405.08.1998GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) ANTI-COUNTERFEITING AND DIFFUSIVE SCREENS
(FR) ECRAN DIFFUSEURS DE PROTECTION CONTRE LA CONTREFAÇON
Abstract
(EN)
Methods of unobtrusively marking documents such as banknotes are disclosed, such marking permitting automatic testing of such documents for authenticity. One such method comprises using graded refractive index variations in a polymer coating for such marking, and another incorporates such marking fractally as part of an artistic or other design on the document. An analogous technique for incorporating fractal authentication coding in audio or video recordings or computer software is also disclosed. Also disclosed are light diffusing screens and masks for use in making such screens.
(FR)
L'invention concerne des procédés permettant d'assurer le marquage dissimulé de documents tels que des billets de banque. Ce marquage permet de vérifier automatiquement l'authenticité des billets. Un procédé de ce type consiste à utiliser des variations de gradients d'indices de réfraction dans un revêtement de polymère prévu pour ce marquage. Un autre procédé consiste à intégrer ce marquage de manière fractale en tant que partie d'un dessin artistique ou autre sur le document. L'invention traite également d'une technique semblable pour incorporer un codage d'authentification fractale dans des enregistrements vidéo ou sonores ou dans un logiciel informatique. L'invention a aussi pour objet des écrans diffuseurs de lumière et des masques utilisés pour fabriquer ces écrans.
Also published as
Latest bibliographic data on file with the International Bureau