Patents by Inventor Frank H. Robertson, III

Frank H. Robertson, III 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).

  • Magneto-optic recording media with protective layer
    Patent number: 4861671
    Abstract: A protective layer for a magneto-optically active layer is formed of an outer impermeable layer and an inner layer that protects the active from the outer layer. The outer layer may be an oxide and the inner layer a non-oxide. The oxide and non-oxide layers may form discreet layers or they may be continuously graded. The graded layer may be formed by reactively sputtering aluminum in the presence of reactive gases, oxygen and nitrogen, while continually varying the flowing reactive gas from nitrogen to oxygen.
    Type: Grant
    Filed: November 25, 1987
    Date of Patent: August 29, 1989
    Assignee: Kerdix, Inc.
    Inventors: Boris J. Muchnik, Frank H. Robertson, III