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US 8,278,244 B2Granted
Laser marking of substrates
AssigneeDatalase Ltd.
InventorsBrian Stubbs, William Green
Life of this patent
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Abstract
A method for marking an substrate, comprising coating the substrate with a white or colorless solution of a soluble alkali or alkaline earth metal salt of a weak acid and irradiating areas of the substrate to be marked such that those areas change color, wherein the substrate comprises a polysaccharide material.
Claims17
A method for marking a substrate, wherein said method comprises:
- coating the substrate with a white or colourless solution of a soluble alkali or alkaline earth metal salt of a weak acid;
- and irradiating areas of the substrate to be marked such that those areas change colour;
- wherein the substrate comprises a polysaccharide material, wherein the substrate is paper, card, board, or a cellulosic textile.
Dependencies are inferred from the claim text.