Patents by Inventor Andrew James Legro

Andrew James Legro 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).

  • Grounding arrangement for a powerline system
    Patent number: 5930099
    Abstract: A grounding arrangement for a normally ungrounded multi-phase powerline system, which also carries dc information signals. A resistance and a spark gap device are provided in a path between system neutral and a ground. Upon the occurrence of a predetermined fault condition the spark gap device will conduct, and if the voltage developed across the resistance is of a predetermined value, a current bypass path is established around the spark gap device after a predetermined time delay.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: July 27, 1999
    Assignee: Siemens Westinghouse Power Corporation
    Inventors: Andrew James Legro, Martin Baier, David D. Shipp