Freeze indicators suitable for mass production

  • US 7,343,872 B2
  • Filed: 11/06/2006
  • Issued: 03/18/2008
  • Est. Priority Date: 11/07/2005
  • Status: Active Grant
First Claim
Patent Images

1. A freeze indicator comprising:

  • (a) an indicator volume;

    (b) an indicator dispersion of solid particles dispersed in a liquid medium, the indicator dispersion being contained in the indicator volume and being capable of coagulating to provide an irreversible appearance change when subject to freezing; and

    (c) at least one vapor block member extending around the indicator volume to prevent loss of liquid vapor from the indicator dispersion.

View all claims

    Thank you for your feedback