Process for making machine readable images
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United States of America Patent
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Jul 22, 1997
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N/A
app pub date -
Jun 7, 1995
filing date -
May 11, 1992
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Abstract
A method of identifying an object by a machine readable image applied to it in which the image is produced by a plurality of fine particles embossed with a machine readable pattern produced by replicating contact with a diffraction grating having from about 5,000 to about 11,000 grooves per cm.
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