Patents by Inventor Hye Jun Choi

Hye Jun 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).

  • Light-colored magnetic particles having improved durability and chemical resistance
    Patent number: 11694827
    Abstract: The present invention can provide light-colored magnetic particles having a zirconium oxide coating layer formed on a magnetic core, and having a silver coating layer formed on the zirconium oxide coating layer, and a part of the surface of the zirconium oxide coating layer is exposed to the outside, but chemical resistance is excellent, and thus the magnetic particles hardly cause a change of magnetic characteristics so as to be suitable for security elements.
    Type: Grant
    Filed: November 8, 2018
    Date of Patent: July 4, 2023
    Assignee: Korea Minting, Security Printing & ID Card Operating Corp.
    Inventors: Hong Keon Kim, Won Gyun Choe, Su Dong Kim, Hyun Soo Kim, E Den Kim, Hye Jun Choi, Ju Hee Kang
  • Security device using light reflection property
    Patent number: 11590792
    Abstract: The present invention relates to a security device comprising a colloidal crystal which exhibits excellent visibility and is also easily manufactured. The security device, according to the present invention, comprises: a substrate; a groove part formed on the substrate; a colloidal crystal positioned in the groove part; and an aging film. The security device, according to the present invention, exhibits excellent security and visibility, and thus may be used for securities, credit cards, security cards, anti-forgery products, etc.
    Type: Grant
    Filed: August 27, 2019
    Date of Patent: February 28, 2023
    Assignee: KOREA MINTING, SECURITY PRINTING & ID CARD OPERATING CORP.
    Inventors: Won Gyun Choe, Su Dong Kim, Hong Keon Kim, Hyun Soo Kim, E Den Kim, Hye Jun Choi
  • SECURITY DEVICE USING LIGHT REFLECTION PROPERTY
    Publication number: 20210354496
    Abstract: The present invention relates to a security device comprising a colloidal crystal which exhibits excellent visibility and is also easily manufactured. The security device, according to the present invention, comprises: a substrate; a groove part formed on the substrate; a colloidal crystal positioned in the groove part; and an aging film. The security device, according to the present invention, exhibits excellent security and visibility, and thus may be used for securities, credit cards, security cards, anti-forgery products, etc.
    Type: Application
    Filed: August 27, 2019
    Publication date: November 18, 2021
    Inventors: Won Gyun CHOE, Su Dong KIM, Hong Keon KIM, Hyun Soo KIM, E Den KIM, Hye Jun CHOI
  • Light-Colored Magnetic Particles Having Improved Durability and Chemical Resistance
    Publication number: 20200357544
    Abstract: The present invention can provide light-colored magnetic particles having a zirconium oxide coating layer formed on a magnetic core, and having a silver coating layer formed on the zirconium oxide coating layer, and a part of the surface of the zirconium oxide coating layer is exposed to the outside, but chemical resistance is excellent, and thus the magnetic particles hardly cause a change of magnetic characteristics so as to be suitable for security elements.
    Type: Application
    Filed: November 8, 2018
    Publication date: November 12, 2020
    Inventors: Hong Keon Kim, Won Gyun Choe, Su Dong Kim, Hyun Soo Kim, E Den Kim, Hye Jun Choi, Ju Hee Kang