Patents by Inventor Dave A. Lehr

Dave A. Lehr 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).

  • Electric arc furnace monitoring system and method
    Patent number: 7991039
    Abstract: A system and method for monitoring the operating parameters of an electric arc furnace having a primary electrical circuit comprising a primary current transformer. The method includes monitoring the furnace's primary current transformer; collecting data therefrom; transmitting the collected data to a server having an operatively connected monitor; and displaying the collected data on the monitor in substantially real-time. The server also collects information about the performance of the furnace from a programmable logic computer and information entered manually by an operator at a furnace monitoring viewer system, which may also be displayed in substantially real-time on the monitor.
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: August 2, 2011
    Assignee: GrafTech International Holdings Inc.
    Inventors: Ronald E. Gerhan, Nicolas Lugo, Dave A. Lehr, Fernando Martinez Garcia
  • Electric arc furnace monitoring system and method
    Publication number: 20060114963
    Abstract: A system and method is disclosed for monitoring the operating parameters of an electric arc furnace having a primary electrical circuit comprising a primary current transformer. The method comprises monitoring the furnace's primary current transformer; collecting data therefrom; transmitting the collected data to a server having an operatively connected monitor; and displaying the collected data on the monitor in substantially real-time. The server also collects information about the performance of the furnace from a programmable logic computer and information entered manually by an operator at a furnace monitoring viewer system, which may also be displayed in substantially real-time on the monitor.
    Type: Application
    Filed: November 30, 2004
    Publication date: June 1, 2006
    Inventors: Ronald Gerhan, Nicolas Lugo, Dave Lehr, Fernando Garcia