Patents by Inventor Seok-Cheol Choi

Seok-Cheol Choi 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).

  • Retroreflective article
    Patent number: 6890634
    Abstract: A retroreflective article includes a flat front surface, and a structured rear surface displaced from the flat front surface. The structured rear surface is provided with arrays of sets of three mutually perpendicular lateral triangular sides, and a plurality of trigonal linear prisms. The three lateral triangular sides have a common apex and uncommon linear base edges. The linear prisms are disposed along at least one of the linear base edges of the three lateral triangular sides.
    Type: Grant
    Filed: September 8, 2000
    Date of Patent: May 10, 2005
    Assignee: LG Chemical Ltd.
    Inventors: Seok-Il Yoon, Jong-Soo Baek, Seok-Cheol Choi