Patents by Inventor Charles James Derrick

Charles James Derrick 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).

  • Integrated cellular voice and digital packet data telecommunications systems and methods for their operation
    Patent number: 5881060
    Abstract: An integrated voice and packet data telecommunications system has at least one dual mode channel. The system comprises a plurality of transceivers, at least one transceiver being operable to transmit and receive voice traffic on the dual mode channel, and at least one transceiver being operable to transmit and receive packet data traffic on the dual mode channel. The system further comprises a controller for controlling the transceivers so as to allocate the dual mode channel either to voice communications or to packet data communications. The controller responds to changing demand for voice channels and packet data channels by changing dynamically the allocation of the dual mode channel. The system is particularly useful for providing Cellular Digital Packet Data (CDPD) services.
    Type: Grant
    Filed: May 30, 1996
    Date of Patent: March 9, 1999
    Assignee: Northern Telecom Limited
    Inventors: Glenn Charles Morrow, Emad Abdel-Lateef Qaddoura, Charles James Derrick, Kenneth W. Pecot, Nivedan Thadasina, Nikhil Jain, Patricia Ann Landgren, Bradley A. Fink