发明名称 |
IMPROVED TIME/TEMPERATURE INDICATORS |
摘要 |
<p>By printing a bar code (comprising dark and light regions) or parts of such a bar code with an ink containing a dye, which changes color in the presence of an acid or a base to remove the contrast between the regions of the bar code, and a neutral compound which releases an acid or a base on exposure to energising radiation, a bar code can be produced that becomes unreadable after a pre-determined interval. This can be used as a time/temperature indicator to ensure that products, which might be perishable, associated with such a bar code are not used by the public.</p> |
申请公布号 |
EP1934561(A4) |
申请公布日期 |
2015.04.29 |
申请号 |
EP20060814591 |
申请日期 |
2006.09.14 |
申请人 |
SUN CHEMICAL CORPORATION |
发明人 |
AZIZIAN, FARID;LEONARD, MICHAEL, WILLIAM |
分类号 |
G01D21/00;B65D81/34;G01K1/02;G01K3/04;G01N31/22 |
主分类号 |
G01D21/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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