Patents by Inventor John D. Wittams

John D. Wittams 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).

  • Mobile radio transmission system using preferred home service area
    Patent number: 5276905
    Abstract: A private mobile radio transmission system comprising a plurality of geographically spaced base stations (BS) defining a plurality of overlapping service areas (SA). The base stations are coupled for example by land-line communication links (CL) to a system controller (SC). Mobile stations (MS) equipped with simplex two-way radios are free to roam through the service areas. In order to be able to make a call with or via a base station it is necessary for the mobile station to be registered with the base station concerned. Details of the registration are stored by the mobile station concerned and the base station.
    Type: Grant
    Filed: February 7, 1990
    Date of Patent: January 4, 1994
    Assignee: U.S. Philips Corporation
    Inventors: Allan F. Hurst, David J. Harrison, John D. Wittams