Patents Assigned to Semitoof, Inc.
  • Patent number: 6365033
    Abstract: A method for measuring a target constituent of an electroplating solution using an electroanalytical technique is set forth in which the electroplating solution includes one or more constituents whose by-products skew an initial electrical response to an energy input of the electroanalytical technique. The method comprises a first step in which an electroanalytical measurement cycle of the target constituent is initiated by providing an energy input to a pair of electrodes disposed in the electroplating solution. The energy input to the pair of electrodes is provided for at least a predetermined time period corresponding to a time period in which the electroanalytical measurement cycle reaches a steady-state condition. In a subsequent step, an electroanalytical measurement of the energy output of the electroanalytical technique is taken after the electroanalytical measurement cycle has reached the steady-state condition.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: April 2, 2002
    Assignee: Semitoof, Inc.
    Inventors: Lyndon W. Graham, Thomas C. Taylor, Thomas L. Ritzdorf, Fredrick A. Lindberg, Bradley C. Carpenter