09645552 is referenced by 2 patents and cites 55 patents.

A time validation indicator is disclosed comprising at least a receiving layer and an activating layer. The receiving layer comprises at least one or more masking colorants and one or more deactivators that cause and maintain the one or more masking colorants in an initial colored state. The activating layer comprises at least one or more migratory activators that migrate into the receiving layer upon at least a portion of the receiving layer being placed in contact with at least a portion of the activating layer to initiate a predetermined time period. The migration of the one or more migratory activators into the receiving layer causes at least a portion of the one or more masking colorants to advance to a final colorless state resulting in a visual color change of the receiving layer that indicates the predetermined time period has elapsed. Also disclosed are methods for creating and using the inventive time validation indicator.

Title
Time validation indicator
Application Number
15/59866
Publication Number
9645552 (B2)
Application Date
March 3, 2016
Publication Date
May 9, 2017
Inventor
Satish Agrawal
Concord
MA, US
Clifford Parker
New Ipswich
NH, US
Louis Cincotta
Andover
MA, US
Agent
Morgan Lewis & Bockius
Assignee
PERFORMACE INDICATOR
MA, US
IPC
G04F 13/02
G01N 21/78
G01N 31/22
C09D 11/50
G04F 1/02
G04F 1/00
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