Patents by Inventor Hyun-Gug Cho

Hyun-Gug 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).

  • Security access system with wireless identification
    Publication number: 20030006879
    Abstract: The present invention relates to a door control system using radio communication. According to the invention, a main device controls the opening and closing of a door by using a portable wireless card. The main device comprises a long wave emitting portion, a very high frequency wave receiving portion, a very high frequency wave emitting portion, memory, processor and recording media in which a program that is executable by the processor is recorded. The portable card comprises a long wave receiving portion, a card processor and recording media in which a program that is executable by the card processor is recorded.
    Type: Application
    Filed: June 20, 2002
    Publication date: January 9, 2003
    Inventors: Joong-Gil Kang, Hyun-Gug Cho