Patents by Inventor James D. McGrath

James D. McGrath 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).

  • Synchronization method and apparatus for a wireless packet network
    Patent number: 5517505
    Abstract: In a wireless TDMA network a control module (CM) sends a time stamp relative to the beginning of its frame in a synchronization packet allowing each of a plurality of user modules (UM) to maintain synchronization relative to the CM. The CM uses a plurality of directional antennas and transmits the synchronization packets over each antenna over a predetermined number of frames. The UMs use a receive time stamp to identify the beginning of a received synchronization packet. The difference between the time stamps combined with a delay constant is used by the UMs to adjust time synchronization to the CM frame.
    Type: Grant
    Filed: December 13, 1993
    Date of Patent: May 14, 1996
    Assignee: Motorola, Inc.
    Inventors: Dale R. Buchholz, Thomas A. Freeburg, Hungkun J. Chang, Michael P. Nolan, Paul Odlyzko, James D. McGrath, William K. Doss, Farzad Farhangnia, Mark Taylor, Jeffrey W. Manning