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US Patent 5,667,303<br />
• Time-Temperature Integrating Indicating<br />
Device Arens et al. 3M<br />
• Issued in September 1997<br />
• New concept of a diffusion tag with<br />
variable E a based on WLF kinetics<br />
• Range 15 Kcal to 30 Kcal/mole<br />
diffusant<br />
matrix<br />
pattern