Patents by Inventor Paul J. Smelters

Paul J. Smelters 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: 4873682
    Abstract: Communication paths in a digital key telephone system are operated by sequentially transferring bit states from origin channels associated with communication ports to exclusively dedicated time slots in a parallel transmission medium. Time slot bit states are selectively stored at designated memory locations corresponding to destination channels associated with the communication ports. The memory locations are read in synchronism with the channel occurrences and bit states from the designated memory locations are asserted in the corresponding channels, any remaining channels having predetermined bit states asserted therein.
    Type: Grant
    Filed: November 30, 1987
    Date of Patent: October 10, 1989
    Assignee: Northern Telecom Limited
    Inventors: George F. Irwin, Paul J. Smelters, David J. Robertson, Ronald J. Maginley