06544925 is referenced by 124 patents.

An activatable time-temperature indicator system useful in tracking the thermal exposure history of a temperature-sensitive perishable product and providing a visually-distinct signal, such as a change in color density, at the expiration of a predetermined time-temperature integral comprises a first element, such as a direct thermal printing label (

11

), comprising a composition (

13

) having at least a first co-reactant of a color-forming reaction. A second, activator element, such as an adhesive tab (

21

) capable of being affixed to the label element, comprises an activator component (

25

), such as a second co-reactant of the color-forming reaction or a solubilizing agent for prompting the interaction of the co-reactants of the label composition. The activator tab element is affixed to the label composition to activate for reaction at ambient conditions the normally high-temperature color-forming composition (

13

) of the label at about the same time as the label is affixed to the perishable product. Such an ability to effect the initiation of the indicator reaction at a given time eliminates any unknown, premature color formation in the indicator system to thereby ensure a true time-temperature history of the perishable product.

Title
Activatable time-temperature indicator system
Application Number
9/517831
Publication Number
6544925 (B1)
Application Date
March 2, 2000
Publication Date
April 8, 2003
Inventor
Allan P Piechowski
Califon
NJ, US
Raymond M Arnold
Harrisonville
NJ, US
Thaddeus Prusik
Stroudsburg
PA, US
Agent
Lionel N White
US
Assignee
LifeLines Technology
NJ, US
IPC
B41M 5/30
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