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Chemical timer for a visual test strip

  • US 5,719,034 A
  • Filed: 09/03/1996
  • Issued: 02/17/1998
  • Est. Priority Date: 03/27/1995
  • Status: Expired due to Term
First Claim
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1. A chemical timer for a visual-reading reagent test strip for measuring the concentration of glucose in a biological fluid that is applied to the strip, the timer comprising a dry coating ofa) a colored indicator composition,b) a reagent that, when hydrated, reacts with glucose to change the color of the indicator,c) an inhibitor to inhibit the change in color of the indicator, andd) glucose,in which the inhibitor and glucose concentrations in the dry coating are selected so that the glucose, over a predetermined time after the biological fluid is applied to the strip, reacts with the reagent to change the color of the indicator.

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