Accession Number : AD0164812
Title : Temperature-Time Integrating Indicator.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON D C
Personal Author(s) : Hu,Kwoh H. ; Loconti,Joseph D.
Report Date : 30 OCT 1973
Pagination or Media Count : 7
Abstract : The invention pertains to a temperature-time integrating indicator for determining the safe limit of storage of a food product or other material which is subject to deterioration due to temperature and length of storage. In its preferred form the temperature-time integrating indicator comprises a transparent polymeric film package containing a warning message. This is enclosed in the package together with an aqueous solution of a redox dye, e.g., sodium anthraquinone beta-sulfonate. The dye is in its reduced state, which is dark red, obscures the warning message. When sufficient time has elapsed at temperatures which may vary, the dye becomes oxidized, turning colorless and revealing the warning message.
Descriptors : *Food, *Storage, *Patents, Temperature, Packaging, Dyes, Monitors, Time, Exposure(General), Deterioration, Sulfonates
Subject Categories : Food, Food Service and Nutrition
Distribution Statement : APPROVED FOR PUBLIC RELEASE