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Devices for use in chemical test procedures

  • US 5,192,502 A
  • Filed: 12/13/1990
  • Issued: 03/09/1993
  • Est. Priority Date: 05/18/1989
  • Status: Expired due to Term
First Claim
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1. In a sample collecting and testing device used in an optical assay for analyte present in a sample liquid, said device comprising a pair of parallel transparent plates with a capillary cavity therebetween to allow uptake of sample liquid therein, one of said plates being a light-transmissive waveguide having a reagent appropriate to the assay immobilized on its internal surface, the improvement wherein the other of said plates has an opaque or light-absorbing material coated on its external surface.

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