发明名称 |
Time-temperature integrating indicator device |
摘要 |
A selectively activated time-temperature integrating device for providing a visually observable indication of cumulative thermal exposure, in which a viscoelastic material migrates into a diffusely light-reflective porous matrix at a rate which varies with temperature to progressively change the light transmissivity of the porous matrix and thereby provide the visually observable indication. The viscoelastic material can comprise a pressure sensitive adhesive. The visually observable indication can comprise latent indicia which initially are not visible and become visible, obscurable indicia which initially are visible and become obscured, or a combination of both. Various actuating means for selectively switching the indicator from an unactivated state to an activated state are described. Also disclosed are a method for providing a visually observable indication of cumulative thermal exposure and a method for providing a time and temperature integrating device for providing a visually observable indication of cumulative thermal exposure of an object.
|
申请公布号 |
US5667303(A) |
申请公布日期 |
1997.09.16 |
申请号 |
US19950402133 |
申请日期 |
1995.03.10 |
申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
ARENS, ROBERT P.;BIRKHOLZ, RUSSELL D.;JOHNSON, DEE LYNN;LABUZA, THEODORE P.;LARSON, CURTIS L.;YARUSSO, DAVID J. |
分类号 |
G01N11/12;G01K3/04;G01K11/12;G01K11/18;G01N3/04;(IPC1-7):G01K3/00 |
主分类号 |
G01N11/12 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|