Patents by Inventor Robert W. Burkhart

Robert W. Burkhart 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 of making edge protected ferrite core
    Patent number: 4451344
    Abstract: The sputter deposition of a thin film of material on both sides of a thin substrate is performed by positioning the substrate sides orthogonal to the target and preferably radial to the deposition center of the sputter system. The vapor deposition of alumina on a thin ferrite core for a magnetic head is accomplished by positioning the ferrite substrate in the vacuum chamber orthogonally to the target and radial to the particle deposition center. The alumina is deposited on both sides of the ferrite core simultaneously to substantially the same thickness. The deposition on both sides of the ferrite core protects the core against width erosion, and minimizes bending stress. In addition, signal output of the ferrite core when used in a magnetic head is increased.
    Type: Grant
    Filed: June 23, 1983
    Date of Patent: May 29, 1984
    Assignee: International Business Machines Corp.
    Inventors: Robert W. Burkhart, Allen R. Cox, John D. Hartley
  • Method of making edge protected ferrite core
    Patent number: 4418473
    Abstract: The sputter deposition of a thin film of material on both sides of a thin substrate is performed by positioning the substrate sides orthogonal to the target and preferably radial to the deposition center of the sputter system. The vapor deposition of alumina on a thin ferrite core for a magnetic head is accomplished by positioning the ferrite substrate in the vacuum chamber orthogonally to the target and radial to the particle deposition center. The alumina is deposited on both sides of the ferrite core simultaneously to substantially the same thickness. The deposition on both sides of the ferrite core protects the core against width erosion, and minimizes bending stress. In addition, signal output of the ferrite core when used in a magnetic head is increased.
    Type: Grant
    Filed: March 26, 1982
    Date of Patent: December 6, 1983
    Assignee: International Business Machines Corp.
    Inventors: Robert W. Burkhart, Allen R. Cox, John D. Hartley