Patents Assigned to Nickel Rainbow Limited
  • Patent number: 6391181
    Abstract: An article includes a colored electroplated metallic coating comprising both nickel and zinc, on an underplate of copper, brass, bright nickel or matt nickel, supported on a metallic or plastic substrate, various colors in the electroplated coating being exemplified. The electrolyte contains Ni2+, Zn2+, (NH4)+ and thiocyanate ions in specified concentrations, but no oxidative ion, color variation of the coating being achieved exclusively by variation of current density, time of the electroplating step and current quantity, provided that the current density at the cathode underplate is within the range of 0.01 to 0.5 A/dm2.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: May 21, 2002
    Assignee: Nickel Rainbow Limited
    Inventors: Larisa Gorodetski, Leonid Levinson