Use of radiofrequency wave absorbing markets for the authentication of security documents
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United States of America Patent
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Feb 28, 2017
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N/A
app pub date -
Mar 30, 2012
filing date -
Apr 1, 2011
priority date (Note) -
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Abstract
The present invention relates to the use of non-deactivatable security compositions comprising the combination of at least two types of particles of oxide materials, where said particles have a different size and/or morphology, and where the inorganic oxide materials have at least one transition metal or one lanthanide element, and radiofrequency wave absorption properties. The invention also relates to security articles, documents or elements incorporating these compositions, as well as to a method and to a system for detection thereof.
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International Classification(s)
- B41M:PRINTING, DUPLICATING, MARKING, OR COPYING PROCESS....
- G01N:INVESTIGATING OR ANALYSING MATERIALS BY DETERMININ....
- C09D:COATING COMPOSITIONS, e.g. PAINTS, VARNISHES, LACQ....
- G07D:SORTING, TESTING, CHANGING, DELIVERING, OR OTHERWI....
- B42D:BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER O....
- G06K:RECOGNITION OF DATA; PRESENTATION OF DATA; RECORD ....
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