Coating processes – Fraud or tamper detecting
Reexamination Certificate
2005-06-14
2005-06-14
Jolley, Kirsten (Department: 1762)
Coating processes
Fraud or tamper detecting
C427S523000, C427S526000, C427S569000, C427S256000, C427S261000, C427S335000
Reexamination Certificate
active
06905725
ABSTRACT:
This invention relates to methods of writing and reading information hidden from visual observation and may be used for visualizing hidden images (marks) identifying an object, which provide protection from unauthorized reproduction (forgery). The method of creation and visualization of an optically invisible mark consists in the following. On the surface of the object in question an optically invisible marking image is formed by means of modification of, at least one part of said surface, after which visualization of said image is established. Prior to formation of the optically invisible marking image the surface of the object in question (carrying the applied image) is made into a mirror. Modification is achieved by changing the surface energy of the parts being modified. In addition the visualization of the optically invisible marking image is achieved by means of establishing in the area of said surface of the object in question a meta-stable environment, by means of which the visually observed image of the optically invisible mark is obtained as differences of the structures, which are formed by particles of the stable phase of the meta-stable environment, on parts of the surface (of the object in question) with different surface energy. Different variants regarding the use of meta-stable environments, as well as methods of formation, on the surface of a object in question, of an optically invisible marking image are provided.
REFERENCES:
patent: 5206496 (1993-04-01), Clement et al.
patent: 5767483 (1998-06-01), Cameron et al.
patent: 0271245 (1988-06-01), None
patent: 2073270 (1997-02-01), None
patent: WO 94/06102 (1994-03-01), None
patent: WO 99/34315 (1999-07-01), None
Dykhne Alexander M.
Nizienko Yuri K.
Jolley Kirsten
Valinmark Inc.
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