Patents by Inventor Rod J. Swanson

Rod J. Swanson 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).

  • Media flaw detection apparatus for a magnetic disk drive with squaring and summing of in-phase and quadrature-phase detected signals
    Patent number: 5121057
    Abstract: A media flaw detection apparatus having a sensitivity which is independent of the location of the flaw relative to the written test signal. The apparatus is equally sensitive to missing or extra bit defects. According to the invention, in-phase and quadrature-phase signals are heterodyned against the analog playback input signal. The resulting signals are squared and summed to produce a signal analogous to the effect of the flaw.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: June 9, 1992
    Assignee: Maxtor Corporation
    Inventors: William D. Huber, Rod J. Swanson, Dennis C. Stark, Nicholas Bucska