Patents by Inventor Debra M. Steffenhagen

Debra M. 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).

  • Method and apparatus for thin film coating an article
    Patent number: 6068738
    Abstract: A method, apparatus and carrier for coating a CRT screen after assembly. The method and apparatus includes isolating a surface portion of the CRT to be coated from the remaining surface to prevent or minimize coating problems resulting from outgassing or difficulty in controlling coating process parameters and to isolate noncompatible components from the deposition environment.
    Type: Grant
    Filed: November 13, 1997
    Date of Patent: May 30, 2000
    Inventors: Erik J. Bjornard, Clifford E. Taylor, Debra M. Steffenhagen, Eric W. Kurman
  • Method and apparatus for thin film coating an article
    Patent number: 5688389
    Abstract: A method, apparatus and carrier for coating a CRT screen after assembly. The method and apparatus includes isolating a surface portion of the CRT to be coated from the remaining surface to prevent or minimize coating problems resulting from outgassing or difficulty in controlling coating process parameters and to isolate noncompatible components from the deposition environment.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: November 18, 1997
    Assignee: Viratec Thin Films, Inc.
    Inventors: Erik J. Bjornard, Eric W. Kurman, Debra M. Steffenhagen, Clifford L. Taylor
  • Method and apparatus for thin film coating an article
    Patent number: 5620572
    Abstract: A method and apparatus for coating a CRT screen after assembly. The method and apparatus includes isolating a surface portion of the CRT to be coated from the remaining surface to prevent or minimize coating problems resulting from outgassing and to isolate noncompatible components from the deposition environment.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: April 15, 1997
    Assignee: Viratec Thin Films, Inc.
    Inventors: Erik J. Bjornard, Eric W. Kurman, Debra M. Steffenhagen
  • Method and apparatus for thin film coating an article
    Patent number: 5489369
    Abstract: A method and apparatus for coating a CRT screen after assembly. The method and apparatus includes isolating a surface portion of the CRT to be coated from the remaining surface to prevent or minimize coating problems resulting from outgassing and to isolate noncompatible components from the deposition environment.
    Type: Grant
    Filed: October 25, 1993
    Date of Patent: February 6, 1996
    Assignee: Viratec Thin Films, Inc.
    Inventors: Erik J. Bjornard, Eric W. Kurman, Debra M. Steffenhagen
  • Four-layer antireflection coating for deposition in in-like DC sputtering apparatus
    Patent number: 5450238
    Abstract: An antireflection coating for a substrate including four layers and having optimized photopic reflectance and optimized for deposition by sputtering. The first layer (the layer farthest from the substrate) has a refractive index less than the refractive index of the substrate and a thickness of about one-quarter wavelength. The second layer (the layer adjacent the first layer) has an refractive index greater than about 2.2 and a thickness of about a half wavelength. The third layer has refractive index less than that of the second layer. The fourth layer (the layer adjacent the substrate) has a refractive index less than about 2.0 and greater than that of the third layer. The combined thickness of the third and fourth layers is less than about a quarter wavelength. The first and third layers may include silicon dioxide. The second layer may include titanium dioxide or niobium oxide. The fourth layer may include indium oxide, tin oxide, indium tin oxide, or zinc oxide.
    Type: Grant
    Filed: December 10, 1993
    Date of Patent: September 12, 1995
    Assignee: Viratec Thin Films, Inc.
    Inventors: Erik J. Bjornard, Debra M. Steffenhagen, Eric R. Dickey
  • DC reactively sputtered optical coatings including niobium oxide
    Patent number: 5372874
    Abstract: A multilayer optical coating including at least one layer of niobium oxide deposited by DC reactive sputtering.
    Type: Grant
    Filed: October 19, 1993
    Date of Patent: December 13, 1994
    Assignee: Viratec Thin Films, Inc.
    Inventors: Eric R. Dickey, Debra M. Steffenhagen