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Multilayer analytical element

  • US RE30,267 E
  • Filed: 05/18/1978
  • Issued: 05/06/1980
  • Est. Priority Date: 06/20/1975
  • Status: Expired due to Term
First Claim
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1. In an integral element useful in the analysis of a fluid sample for a predetermined analyte, the element includinga reagent capable of interacting in the presence of said analyte to produce a decomposition product;

  • and2. a reagent capable of interacting with said decomposition product or an intermediate to provide a detectable change;

    the improvement comprisinga barrier composition separating substantially all of .[.said.]. said reagent (1) from said reagent (2), said barrier composition being substantially uniformly permeable to said decomposition product and substantially impermeable to interferants.

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