Patents by Inventor Debra Steffenhagen

Debra Steffenhagen 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).

  • Electrically-conductive, light-attenuating antireflection coating
    Patent number: 5407733
    Abstract: A coating for an article comprising layers of nitrides of certain transition metals to provide an electrically-conductive, light-attenuating, antireflection surface.
    Type: Grant
    Filed: September 3, 1991
    Date of Patent: April 18, 1995
    Assignee: Viratec Thin Films, Inc.
    Inventors: Erik J. Bjornard, Debra Steffenhagen, R. Russel Austin