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Chemical detector

  • US 5,490,971 A
  • Filed: 10/25/1994
  • Issued: 02/13/1996
  • Est. Priority Date: 10/25/1994
  • Status: Expired due to Fees
First Claim
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1. Apparatus for chemical detection, comprising:

  • a cap for coupling with a sample vial containing a sample which includes at least one chemical to be detected;

    a reagent vial included in the cap, the reagent vial containing a liquid reagent and including a membrane which retains the liquid reagent above the membrane, wherein said membrane is permeable to the chemical to be detected; and

    means, coupled to the cap, for moving the reagent vial between a first position and a second position, the chemical being prevented from permeating the membrane and entering the reagent vial when the reagent vial is in the first position, the chemical being allowed to permeate the membrane and enter the reagent vial when the reagent vial is in the second position.

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