Method and apparatus for detecting bacteria

  • US 6,589,761 B1
  • Filed: 09/14/2000
  • Issued: 07/08/2003
  • Est. Priority Date: 06/19/1999
  • Status: Expired due to Fees
First Claim
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1. A device for detecting bacterial growth in a selected substance wherein a byproduct of said growth is carbon dioxide and wherein said carbon dioxide in the presence of ambient water results in the production of carbonic acid yielding an increase in hydrogen ion concentration and a decrease in pH, said device comprising in combination:

  • a. a CO2 impermeable transparent support base;

    b. a quantity of an indicator having the property of exhibiting a color change upon exposure to a decrease in pH disposed upon said base;

    c. a CO2 permeable cover disposed over said indicator and said base;

    said base, indicator and cover forming a composite which when said cover is placed in proximity to said substance will provide an indication of bacterial growth though an observable color change of said indicator.

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