Patents by Inventor Sang-Duk Bae

Sang-Duk Bae 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 and system for generating security access key value for radio frequency card
    Publication number: 20030088777
    Abstract: A method and system for generating a unique security access key value for a radio frequency (RF) card are provided so that different kinds of RF cards issued by different companies can be read using a single card terminal in order to collect charge for the use of the RF cards.
    Type: Application
    Filed: November 7, 2002
    Publication date: May 8, 2003
    Inventors: Sang-Duk Bae, Jin-Soo So