Patents by Inventor Guang-Sub Cho

Guang-Sub Cho 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).

  • Multi-electrodes double tube fluorescent lamp
    Patent number: 7745997
    Abstract: A multi-electrode double tube fluorescent lamp includes first external electrodes formed at two ends of an outer glass tube or an inner glass tube, and a second external electrode formed at an inner wall surface of the inner glass tube in a longitudinal direction. A first power source is connected with the first external electrode, and a second power source is connected with the second external electrode. A third external electrode formed along an outer surface of the outer glass tube is connected with the second power source. The second external electrode and the third external electrode are arranged in a radial shape in a direction vertical with respect to the longitudinal direction.
    Type: Grant
    Filed: October 18, 2006
    Date of Patent: June 29, 2010
    Assignee: Kwang Woon Display Technology Co., Ltd.
    Inventor: Guang-Sub Cho