Patents by Inventor Graham N. Avis

Graham N. Avis 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).

  • Subscriber unit for wireless digital telephone system
    Patent number: 5177741
    Abstract: In a wireless digital telephone system, a circuit for determining in a subscriber unit whether a particular RF channel is of the type designated by the base station to be either a control channel or a voice channel and for determining whether the channel is in the transmit or receive mode; the circuit utilizing the duration of an AM hole to determine the type of the channel and utilizing a unique word for determining the mode.
    Type: Grant
    Filed: October 12, 1988
    Date of Patent: January 5, 1993
    Assignee: International Mobile Machines Corporation
    Inventors: David N. Critchlow, Graham N. Avis, Sandra J. K. Earlam, Karle J. Johnson, Bruce A. Smetana, Gregory L. Westling, Eric Paneth, Moshe Yehushua