Patent ID: 6627443
Filing Date: 2003-09-30
Classification: B65D,G01N,Y10T

Abstract:
A method of preparing a transparent flexible container for storing a perishable fluid, which container visually indicates if the perishable fluid has been inadvertently exposed to environmental oxygen which method comprises the subsequent steps of:a) assembling together in a controlled atmosphere a transparent, airtight, outer sealing envelope and a primary container made of a partially oxygen permeable material such that a space is defined between the inner container and the outer sealing envelope, said inner container being filled with a perishable fluid; b) disposing an oxygen scavenging composition and an oxygen indicator having a reversible color reaction in said space, wherein the oxygen indicator comprises an aqueous solution of an agent containing a pyrrogallol entity, a salt of iron (II), and an acid; c) sealing the airtight outer envelope; and d) subjecting the container to sterilization.