Patent ID: 11951761
Assignee: TEMPTIME CORPORATION
Field: Measurement (Instruments)
Classification: CPC B  G  C | IPC B  G

Claim 0:
1. An environmental monitor, comprising:
a substrate;
an environmental indicator material supported by the substrate and configured to change its color state responsive to a predetermined environmental exposure other than light exposure; and
a security material supported by the substrate, the security material being either a photochromic material configured to change its color state when exposed to specific light wavelengths or a luminescent material configured to give a bright appearance of a predetermined color when exposed to the specific light wavelengths;
wherein the environmental monitor is selected from the group consisting of a humidity exposure monitor, an oxygen exposure monitor, a freeze monitor, a thaw monitor, a peak heat exposure monitor, a cumulative heat exposure monitor, a current temperature indicator, a pH indicator, and combinations thereof; and
wherein the change of the color state of the environmental indicator material is a change of transparency which reveals or obscures the security material.