Patents by Inventor Sung Tae Yoo

Sung Tae Yoo 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).

  • Keytop sheet using film and its manufacturing method
    Patent number: 6383604
    Abstract: In the present invention, a molding process of keptops is performed by inserting a previously silk-printed thin film into a mold. Therefore, it is possible to implement a small sized and light product by connecting a plurality of keytops using a film, and a tactile feel of a user is increased. In addition, in the present invention, since a silk printing process is not required, the productivity of a keytop sheet is enhanced, and it is possible to decrease the defect rate of the product compared to the conventional art.
    Type: Grant
    Filed: October 6, 1999
    Date of Patent: May 7, 2002
    Assignee: LG Information & Communications, Ltd.
    Inventors: Sung Tae Yoo, Chul Jin Kim