Patents by Inventor John W. J. Williams

John W. J. Williams 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).

  • Digital key telephone system
    Patent number: 5136585
    Abstract: A key telephone system includes a plurality of ports linked by port associated bidirectional communication channels which are synchronously switched by transferring bit states between ones of the channels to provide communication paths between the ports as directed by a central processor. The ports are also linkable to and via the central processor by port associated message channels. An interface circuit is responsive to the central processor and message channel signals for regulating flow of messages received by the central processor and for effecting single and plural channel distribution of messages from the central processor. The message channels permit telephony operating features and functions to be provided either within the central processor or by appropriate apparatus means being connected at any of the ports. In such a telephone system at least one of said apparatus comprises a telephone station apparatus and another of said apparatus comprises a feature host apparatus.
    Type: Grant
    Filed: March 1, 1989
    Date of Patent: August 4, 1992
    Assignee: Northern Telecom Limited
    Inventors: Nadir Nizamuddin, Alan S. J. Chapman, John W. J. Williams, Alan M. Redmond
  • Digital key telephone system
    Patent number: 4893310
    Abstract: A key telephone system includes a plurality of ports being linked by port associated bidirectional communication channels which are synchronously switched by transferring bit states between ones of the channels to provide communication paths between the ports as directed by a central processor. The ports are also linkable to and via the central processor by port associated message channels. An interface circuit is responsive to the central processor and message channel signals for regulating flow of messages received by the central processor and for effecting single and plural channel distribution of messages from the central processor. The message channels permit telephony operating features and functions to be provided either within the central processor or by appropriate apparatus means being connected at any of the ports.
    Type: Grant
    Filed: March 10, 1988
    Date of Patent: January 9, 1990
    Assignee: Northern Telecom Limited
    Inventors: David J. Robertson, Ronald J. Maginley, Alan S. J. Chapman, Terence N. Thomas, Nadir Nizamuddin, John W. J. Williams, Alan M. Redmond, Robert S. Morley