Patents by Inventor Hyeong-Chull Na

Hyeong-Chull Na 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).

  • Method for checking the existence of an optical disk using a focusing signal
    Patent number: 7012858
    Abstract: A method for checking the existence of an optical disk using a focusing signal is provided. The method in accordance with the present invention prevents misjudgement of the existence of an optical disk which is caused by noise contained in a focus error signal or by the low reflection ratio of a disk.
    Type: Grant
    Filed: November 14, 2000
    Date of Patent: March 14, 2006
    Assignee: LG Electronics Inc.
    Inventors: Hong Jo Jeong, Hyeong-Chull Na