07188780 is referenced by 26 patents and cites 214 patents.

An indicator system with a dispenser providing controlled release of a volatile material contained within a dispenser, which indicates the exhaustion of the volatile material. The dispenser includes a blister that contains a vapor permeable membrane that collapses on a bottom wall due to internal vacuum forces created by the evacuation of volatile material. As the membrane collapses the remaining volatile material migrates to the periphery of the dispenser thereby indicating exhaustion of the volatile material.

Title
Volatile material expiration indicating system
Application Number
10/880634
Publication Number
7188780 (B2)
Application Date
June 30, 2004
Publication Date
March 13, 2007
Inventor
Edward J Martens III
Racine
WI, US
Assignee
S C Johnson & Son
WI, US
IPC
B65D 73/00
A61L 9/04
View Original Source