FLAKE FOR COVERT SECURITY APPLICATIONS

WIPO Patent Application WO2005017048

A3

Covert flakes having one or more symbols and/or a selected shape are used in a composition, such as ink or paint, to provide a covert security feature to an object. In some embodiments the composition includes base pigment, and the covert flakes are covert pigment flakes that match the visual characteristics of the base pigment. In other embodiments, clear or opaque covert flakes are mixed in the carrier with base pigment. In other embodiments, clear or opaque covert flakes are mixed in a varnish base to provide a clear composition that can be applied over an existing security feature or elsewhere. The composition is used to print a field on the object, such as a stock certificate or bank note, for example. The covert flakes are not readily detectable by causal observation under visible light. In one embodiment, illuminating the covert security feature with ultraviolet light causes a covert flake to fluoresce and allows the observer to identify the location of the covert flake so that cover indicia may be observed. In a particular embodiment, a covert flake having one or more symbols is located using non-visible radiation, and then observed under visible light to read the symbol(s) on the covert flake.

ARGOITIA ALBERTO (US)
COOMBS PAUL G (US)
MARKANTES CHARLES T (US)

PCT/IB2004/002615

August 04, 2005

August 11, 2004

Click for automatic bibliography generation  

JDS UNIPHASE CORP (US)
ARGOITIA ALBERTO (US)
COOMBS PAUL G (US)
MARKANTES CHARLES T (US)

B44F1/12; C06B23/00; C09C1/00; C09C1/04; C09D5/36; H01F10/12; (IPC1-7): C09C1/04; C06B23/00; C09C1/00; C09D5/36

WO2002040599A1	2002-05-23
WO2002053677A1	2002-07-11
WO2001003945A1	2001-01-18
WO2003102084A1	2003-12-11

EP0978373A2	2000-02-09
US20020021003A1	2002-02-21

View/Download PDF      PDF Help

Previous Patent: COLOURING PREPARATIONS

Next Patent: METHOD FOR TREATING THE SURFACE OF A TITANIUM DIOXIDE PIGMENT