Patents by Inventor John T. Hachman, Jr.

John T. Hachman, Jr. has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Apparatus and method for controlling plating uniformity
    Patent number: 6802950
    Abstract: The use of an insulating shield for improving the current distribution in an electrochemical plating bath is disclosed. Numerical analysis is used to evaluate the influence of shield shape and position on plating uniformity. Simulation results are compared to experimental data for nickel deposition from a nickel—sulfamate bath. The shield is shown to improve the average current density at a plating surface.
    Type: Grant
    Filed: November 26, 2002
    Date of Patent: October 12, 2004
    Assignee: Sandia National Laboratories
    Inventors: John T. Hachman, Jr., James J. Kelly, Alan C. West