Patents by Inventor Kenneth David Mackay

Kenneth David Mackay 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).

  • Reverse magnetic reset to screen for weakly pinned heads
    Patent number: 7138797
    Abstract: A method is disclosed for testing pinned layers of magnetic disk drive read heads having at least one pinned layer, where the magnetic orientation of the pinned layers has been set in an initial direction. The method includes applying a large magnetic test field at a reverse canted reset angle. First test responses from the disk drive read heads are then measured in a small magnetic test field. A large magnetic test field is applied at normal canted reset angle. The disk drive heads are then subjected to a full suite of performance tests in a small magnetic test field to verify their acceptability. These second test responses are then compared to the first test responses to identify read heads having weakly pinned layers.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: November 21, 2006
    Assignee: Hitachi Global Storage Technologies Netherlands, B.V.
    Inventors: Ciaran Avram Fox, Kenneth David Mackay, Vladimir Nikitin