Patents Examined by Arlen Sodequist
  • Assay method for the determination of lithium with novel substituted crown dyes
    Patent number: 5344782
    Abstract: Assay methods are provided for determining the presence of lithium in high sodium content liquids such as serum, plasma, urine or other sample without deproteinization. The novel compounds are water soluble derivatives of TMC-crownformazans and provide signal enhancement by increased absorbance of the dye-lithium complex over the dye anion.
    Type: Grant
    Filed: March 4, 1993
    Date of Patent: September 6, 1994
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Cheng-I Lin, Marcel Pirio