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Test strips and methods and apparatus for using the same

  • US 3,980,437 A
  • Filed: 12/18/1975
  • Issued: 09/14/1976
  • Est. Priority Date: 12/21/1974
  • Status: Expired due to Term
First Claim
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1. A test strip of the type which, after being dipped in a liquid such as urine, will assume a color indicative of a property of the liquid, comprising a transparent backing through which light can freely pass, a color-reaction paper for assuming a given degree of a given color when detecting the intensity of a given property of a liquid in which the paper is immersed, said color-reaction paper being situated on one side of but being spaced from said backing, and fastening means situated between the paper and backing and fastening the paper to the backing, said fastening means having at least the same area as said paper and engaging the latter throughout its entire area which is directed toward the backing, and said fastening means being substantially opaque and non-reflecting with respect to light, so that light will pass freely through said backing at portions thereof not engaged by said fastening means while light will be reflected from said color-reaction paper while remaining substantially uninfluenced by said fastening means and backing.

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