Patents by Inventor Donald B. Keeler

Donald B. Keeler 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).

  • Providing a supplementary service in a mobile communications system
    Patent number: 6801781
    Abstract: A mobile communications system includes a system controller that provides access control for mobile stations within the network controlled, by the system controller. In one example, the mobile communications network is a General Packet Radio Service (GPRS) network. The system controller provides access to a packet-based data network. In addition, the system controller enables prepaid short message service (SMS), in which mobile stations can originate or receive short messages according to the prepaid SMS. A flag kept in a home location register (HLR) stores a field to indicate if the user has subscribed to prepaid SMS. In one embodiment, the field is an access point name (APN) field according to the General Packet Radio Service (GPRS) protocol.
    Type: Grant
    Filed: October 31, 2000
    Date of Patent: October 5, 2004
    Assignee: Nortel Networks Limited
    Inventors: Curtis M. Provost, Jerry L. Mizell, Donald B. Keeler