Patents Assigned to Wako Pure Chemicals Co., Ltd.
  • Oxidizable color producing reagent
    Patent number: 5238818
    Abstract: This amount of an oxidative substance or a peroxidase-like substance can be determined by using a combined color former comprising 4-aminoantipyrine or a derivative thereof, etc., as a main color former and a p-fluoroaniline derivative or a salt thereof as a color producing component.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: August 24, 1993
    Assignee: Wako Pure Chemicals Co., Ltd.
    Inventors: Kazunari Hashizume, Haruhiko Sugiyama, Mutsuhiro Date