Laser coding
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United States of America Patent
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May 3, 2005
Grant Date -
Oct 2, 2003
app pub date -
Feb 27, 2002
filing date -
Feb 28, 2001
priority date (Note) -
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Abstract
A method for making 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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