Laser marking
AssigneeDatalase Ltd.
InventorsAnthony Nicholas Jarvis, Martin Robert Walker
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Abstract
An ink formulation comprises a marking component, e.g. ammonium octamolybdate, and a metal salt that absorbs laser irradiation at 780-2500 nm, e.g. reduced indium tin oxide, and thereby causes the marking component to change colour.
Claims25
An ink formulation comprising a marking component and a non-stoichiometric metal salt, wherein the marking component in the absence of the metal salt undergoes a colour change in response to laser irradiation at a wavelength above 2500 nm but not between 780-2500 nm, and the metal salt absorbs laser radiation at 780-2500 nm, thereby causing the marking component to change colour.
A method of applying an inorganic non-stoichiometric compound on to a substrate that comprises a marking component, wherein the marking component undergoes a colour change in response to laser irradiation at a wavelength above 2500 nm but not between 780-2500 nm, and the compound absorbs laser radiation at 780-2500 nm, thereby causing the marking component to change colour;
- and wherein said method comprises using a sputtering process.
Dependencies are inferred from the claim text.