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Apparatus for producing gradient elution in a liquid chromatographic system

  • US 4,239,623 A
  • Filed: 01/07/1980
  • Issued: 12/16/1980
  • Est. Priority Date: 02/10/1979
  • Status: Expired due to Term
First Claim
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1. An apparatus for producing gradient elution in a liquid chromatographic system, said apparatus comprisingvariable dosing means for at least two different solvents said dosing means including variable flow resistances for said solvents;

  • mixing means for mixing said solvents and delivering a solvent mixture;

    pump means for feeding said solvent mixture to a chromatographic column;

    density measuring means for measuring the density of said solvent mixture said density being a function of the mixing ratio of said different solvents; and

    control means responsive to said density measuring means for adjusting said flow resistances in accordance with a given nominal density curve corresponding to a desired elution gradient.

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