Patent ID: 6677159
Filing Date: 2004-01-13
Classification: G01N,Y02A,Y10T

Abstract:
A reversible carbon dioxide detector comprising:a primed substrate comprising a primer comprising a first amount of a first plurality of dyes comprising pH sensitive color indicators and an amount of moisture effective to permit said pH sensitive color indicators to interact with carbon dioxide without substantial migration or flow of said first plurality of dyes on said substrate; a coating over at least a portion of said substrate, said coating comprising a second amount of an effective activator, a third amount of a water insoluble organic binder, and a fourth amount of a second plurality of dyes comprising carbon dioxide sensitive color indicators; wherein said water insoluble binder facilitates permeation of carbon dioxide from a surrounding medium through said coating into reversible contact with a combination of said first plurality of dyes and said second plurality of dyes; wherein said first, second, third, and fourth amounts are effective to permit said combination of said first plurality of dyes and said second plurality of dyes to interact with said carbon dioxide to substantially instantaneously produce incremental reversible changes in color comprising a reproducible array of separate colors in which said separate colors correlate to separate given concentrations of carbon dioxide in a surrounding medium.