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US 2012/0068449 A1Published application
Application of unique surface coatings to high volume manufacturing output
AssigneeSmartwater Research Limited
InventorsMichael Cleary, Marcello Vitale
Life of this patent
Estimating the term…
Abstract
A photographic material for image display including an intimately sorbed contrast agent that provides a contrast layer against which the recorded image can be seen regardless of the nature and colour of the background.
Claims14
A method of producing batches of micro particles, comprising the steps of:
- creating a photographic material having a plurality of batch unique codes imaged thereon;
- forming a contrast layer of uniform colour, which may suitably be white, onto the material by exposing the photographic material to an aqueous dispersion containing a contrast agent for a period of time to allow sorption of the contrast agent and then rinsing the photographic material to wash away any unsorbed excess contrast agent;
- and
- cutting the material to define a plurality of micro particles, each micro particle having a primary identifier in the form of said batch unique code.
1 more element
A micro particle comprising:
- a photographic material carrying the image of a primary identifier;
- and
- a contrast layer, whereby the contrast layer is sorbed by the material and contrasts with the primary identifier.
A method of verifying the authenticity of an item, comprising the steps of:
- applying a plurality of the micro particles to an item, the micro particles carrying the image of a unique security marking and having a contrast layer thereon;
- viewing the item containing the micro particle and comparing the code obtained with the corresponding unique security marking to verify its authenticity or otherwise.
Dependencies are inferred from the claim text.