Patents by Inventor Tab C. Nielsen

Tab C. Nielsen 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).

  • Disk drive servosystem using gray code
    Patent number: 5268800
    Abstract: A servosystem for controlling position of a magnetic head relative to a magnetic storage disk in a disk drive includes first and second feedback loops which provide head position error signals. The first feedback loop includes a head position circuit that processes different recorded Gray coded binary expressions that identify the data tracks on the disk during a track seek mode. The second feedback loop includes a head position circuit which, during the seek and track following modes, processes recorded quadrature servo signals that are interleaved with the data tracks.
    Type: Grant
    Filed: November 13, 1990
    Date of Patent: December 7, 1993
    Assignee: Areal Technology
    Inventor: Tab C. Nielsen