Patents by Inventor Patrick S. Kelly

Patrick S. Kelly 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).

  • Power feeding submarine telecommunications systems
    Patent number: 4641372
    Abstract: An optical undersea telecommunications system has a main cable (1) which branches (BU1) near a landfall to two separate stations. Each branch (71,81) supplies half the current of the main cable (1) for powering the regenerators. In the event of a fault in a branch (e.g. 81) caused by an anchor or fishing gear, the operations branch (71) regenerator (e.g 11) can supply the full current (I) via a zener diode power feed and bypass circuit and high voltage diodes (D1,D2) automatically prevent leakage of current back to the fault.
    Type: Grant
    Filed: September 20, 1984
    Date of Patent: February 3, 1987
    Assignee: STC PLC
    Inventors: Patrick S. Kelly, Thomas Oswald, Alan J. Jeal, Stephen E. Hill, Robert Murphy