Patents by Inventor Edward K. Johnson

Edward K. Johnson 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).

  • Trunking method and apparatus for establishing communication in a two-way mobile radio system
    Patent number: 5125101
    Abstract: A moble radio system is disclosed in which communication is established between at least two user-operable stations over one of a plurality of channels by operating the user-operable stations in accordance with the following steps:(1) When in the receive mode (the push-to-talk switch is open):(i) incrementing the channel selector to select a channel;(ii) determining if a carrier signal is present on the selected channel:(iii) if a carrier signal is not present, returning to step (1) (i);(iv) if a carrier signal is present, determining if the selected trunk identification signal is present on the carrier signal;(v) if the selected trunk identification signal is not present, returning to step (1) (i); and(vi) if the selected trunk identification signal is present on the carrier signal, enabling said transmitter for push-to-talk operation.
    Type: Grant
    Filed: February 16, 1990
    Date of Patent: June 23, 1992
    Assignee: Etrunk Systems, Inc.
    Inventors: Edward K. Johnson, Fred E. Stuebner