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Matrix controlled method of delayed fluid delivery for assays

  • US 5,135,872 A
  • Filed: 04/28/1989
  • Issued: 08/04/1992
  • Est. Priority Date: 04/28/1989
  • Status: Expired due to Fees
First Claim
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1. A method for delivering at least two predetermined volumes of a liquid to a reaction zone which comprises introducing the liquid into at least first and second conduits each having an outlet communicating with the reaction zone and spaced therefrom, the conduits each having a matrix plug therein at a level below the level of liquid introduction and spaced therefrom, and above the outlet of its respective conduit, each matrix plug delaying the first release and rate of delivery of the liquid from its respective conduit, the matrix plug in the first conduit being different from the matrix plug in the second conduit, such that the first release of liquid from the first conduit is delayed until liquid flow from the second conduit is terminated or until after liquid flow from the second conduit has begun.

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