Laser coding
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United States of America Patent
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app pub date -
May 31, 2005
filing date -
Feb 28, 2001
priority date (Note) -
Abandoned
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Abstract
A method for marking an object, wherein the object comprises a material including a functional group and a metal compound or acid that causes an elimination reaction on irradiation with a laser, to form a reaction product of contrasting colour, comprises directing a laser beam on to the areas of the object to be marked For example, by using a carbohydrate and a metal salt, effective marking can be achieved on the coating of a pill or other edible material.
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