Patents by Inventor John Kirchberg

John Kirchberg 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).

  • Composite structure with single domain magnetic element, and thin film magnetic head incorporating same
    Patent number: 5995336
    Abstract: A surface smooth enough to allow the formation thereon of a single domain magnetic element is obtained by covering a polished layer with a thin layer of the same material, to smooth sharp edges and corners. The resulting structure is useful in thin film magnetic heads.
    Type: Grant
    Filed: August 31, 1993
    Date of Patent: November 30, 1999
    Assignee: North American Philips Corporation
    Inventors: Paul F. Michalek, John Kirchberg, John A. Rice
  • Method of making composite structure with single domain magnetic element
    Patent number: 5269895
    Abstract: A surface smooth enough to allow the formation thereon of a single domain magnetic element is obtained by covering a polished layer with a thin layer of the same material, to smooth sharp edges and corners. The resulting structure is useful in thin film magnetic heads.
    Type: Grant
    Filed: December 3, 1991
    Date of Patent: December 14, 1993
    Assignee: North American Philips Corporation
    Inventors: Paul F. Michalek, John Kirchberg, John A. Rice