Patents by Inventor Bruce A. Gray

Bruce A. Gray 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).

  • Electrolytic chromium etching of chromium-layered semiconductor
    Patent number: 4078980
    Abstract: A layer of chromium is removed from the metalization system on a silicon integrated circuit wafer that also includes copper and aluminum. By electrolytic etching in a sulfuric acid solution containing about 10% by volume water saturated with chromium sulfate, chromium can be removed without excessive removal of copper or aluminum.
    Type: Grant
    Filed: October 1, 1976
    Date of Patent: March 14, 1978
    Assignee: National Semiconductor Corporation
    Inventors: James M. Harris, William M. Gouin, Bruce Gray