Inventors:
Chan U. Ko - Arcadia CA, US
Eung Lee - Mentor OH, US
Donald E. Banks - Huntington Beach CA, US
Jerry G. Hodsdon - Forestdale MA, US
Jesse C. Ercillo - Covina CA, US
Assignee:
Avery Dennison Corporation - Pasadena CA
International Classification:
B32B 9/00
B32B 33/00
G01N 31/00
G04F 1/00
US Classification:
428 401, 428 417, 436 2, 368327
Abstract:
The present invention relates to the present invention relates to a time indicating label comprising (a) a label substrate having a first and second surface, (b) an acid-base indicator composition, and (c) an activator composition, wherein one of (b) or (c) are on the first surface of the substrate and wherein (b) and (c) when brought in contact remain adhered. The label may have a pressure sensitive adhesive on the second surface of the label. The invention further relates to a method of using the time-temperature indicating label. The labels provide an effective means for determine the safety of frozen foods. The labels also provide a means of providing security by providing name badges that are time sensitive and may not be reused. The name badges provide a means to monitor the length of a visitor's time and prevents reusing the name badge.