Patents by Inventor Lawrence E. Roohr

Lawrence E. Roohr 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 cross correlating track crossing signal with ideal signal to calibrate jog value
    Patent number: 8305705
    Abstract: A disk drive is disclosed comprising a disk including a plurality of tracks, and a head actuated over the disk, wherein the head comprises a read element radial offset from a write element. A jog value corresponding to the radial offset is calibrated by writing data to a plurality of tracks, reading the plurality of written tracks to generate an actual track crossing signal, cross correlating the actual track crossing signal with an ideal track crossing signal to generate a cross correlation signal, and calibrating the jog value in response to the cross correlation signal.
    Type: Grant
    Filed: May 5, 2010
    Date of Patent: November 6, 2012
    Assignee: Western Digital Technologies, Inc.
    Inventor: Lawrence E. Roohr
  • Wide range high stability variable gain amplifier
    Patent number: 4963836
    Abstract: A variable gain amplifier system with a temperature stabilized exponential control signal input and wide range amplifier.
    Type: Grant
    Filed: June 23, 1989
    Date of Patent: October 16, 1990
    Assignee: Digital Equipment Corporation
    Inventors: Robert Y. Noguchi, Lawrence E. Roohr