Patents by Inventor Robert B. MacKenzie

Robert B. MacKenzie 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).

  • Telecommunications systems with user programmable features
    Patent number: 4530090
    Abstract: A processor controlled PBX system with central control and distributed group control using a processor per group. The PBX employs time division controlled speech transmission and data switching. Features of the system are programmable by the system maintenance personnel. The programmable features include the number of time slots or channels in use triggering a priority call control mode. The transfer of data between processors for monitoring may also be controlled along with the correction of data in system backup memory.
    Type: Grant
    Filed: July 29, 1983
    Date of Patent: July 16, 1985
    Assignee: International Standard Electric Corporation
    Inventors: Lawrence Priamo, Robert B. MacKenzie