Patents by Inventor Yongjoong Lee

Yongjoong Lee 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).

  • Arc furnace power supply device
    Publication number: 20070247079
    Abstract: An arc furnace power supply device with a rectifier is specified, which rectifier on its alternating voltage side can be connected with an electrical alternating voltage supply network and on its direct voltage side is connected with a direct voltage circuit. Moreover the arc furnace power supply device comprises an inverter, which inverter on its direct voltage side is connected with the direct voltage circuit and on its alternating voltage side with at least one arc electrode. For improvement of the stability and even burning of the arc the inverter is configured as an inverter that applies a rectangular alternating voltage to the arc electrode.
    Type: Application
    Filed: April 20, 2007
    Publication date: October 25, 2007
    Applicant: ABB Schweiz AG
    Inventors: Daniel Sager, Yongsug Suh, Yongjoong Lee, Henrik Nordborg