Patents by Inventor Mark L. Shaughnesy

Mark L. Shaughnesy 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).

  • Radio communication apparatus and method for voice channel busy call back
    Patent number: 5287551
    Abstract: An apparatus and method for issuing busy call-backs (146) on the voice channel to busied communication units (209,211) on a trunked radio communication system (200) is disclosed. This is accomplished, in part, by issuing a busy signal (104), via a control resource (203), to a communication unit when a requested communication resource is unavailable. Additionally, the radio communication unit (209,211) is capable of receiving the busy signal via the control resource (213) and participating in a second communication while in a busied state. The resource controller (201) is capable of allowing the busied communication unit (209,211) to participate in a second communication on a second communication resource (215) and issuing the call-back signal during the second communication.
    Type: Grant
    Filed: October 21, 1992
    Date of Patent: February 15, 1994
    Assignee: Motorola, Inc.
    Inventors: Leslie G. Gustafson, Jr., Sewim F. Ablay, Mark L. Shaughnesy