Patents by Inventor Chris Buchanan

Chris Buchanan 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).

  • Circuit arrangement for providing internet connectivity to a computer in a key telephone system
    Patent number: 5991293
    Abstract: A circuit arrangement is provided for connecting a personal computer (PC) to a port of a key telephone system via an adapter circuit which also interfaces a digital key set to the port. The adapter circuit is connected to the computer via an RS-232 single channel data link. The PC is programmed to generate and receive a serial data stream into which are encapsulated messages relating to link control and telephone functionality. The adapter circuit is also programmed to receive and generate the serial data stream. The data rate through the adapter circuit and the telephone system and hence to a remote computer is dependent on the utilization of the attached key set by the user to make a call.
    Type: Grant
    Filed: May 23, 1997
    Date of Patent: November 23, 1999
    Assignee: Nortel Networks Corporation
    Inventors: Chris Buchanan, Dick Keilty, Ron Wellard, Chi-Yin Wong, Tim Jenkins, Timothy Winston Hibberd