Thermochromic bar code
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United States of America Patent
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Feb 3, 2004
Grant Date -
May 16, 2002
app pub date -
Dec 3, 1999
filing date -
Dec 6, 1997
priority date (Note) -
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Abstract
A bar code (10) incorporating thermochromic materials in selected modules (20) such that its code changes with temperature. Below a specified temperature, the bar code (10) displays a first code. Above this temperatures, the bar code (10) displays a second code. The bar code (10) is printed with conventional printing equipment onto conventional printing media, and is scanned with conventional bar code scanning equipment.
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