Patents by Inventor Jong Ho Cheong

Jong Ho Cheong 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).

  • Copolymers containing N-vinyllactam derivatives, preparation methods thereof and photoresists therefrom
    Patent number: 6262222
    Abstract: Copolymers containing N-vinyllactam derivatives protected at 3-position are provided and represented by the following formula. The copolymers are used as a photoresist material suitable for deep uv process so that high sensitivity and resolution can be obtained. In addition, ultrafine circuits can be formed and an exceptional improvement in PED stability can be accomplished by use of the photoresist.
    Type: Grant
    Filed: October 8, 1998
    Date of Patent: July 17, 2001
    Assignee: Hyundai Electronics Industries Co., Ltd.
    Inventors: Jin Baek Kim, Min Ho Jung, Jong Ho Cheong
  • Copolymers containing N-vinyllactam derivatives, preparation methods thereof and photoresists therefrom
    Patent number: 6051678
    Abstract: Copolymers containing N-vinyllactam derivatives protected at 3-position are provided and represented by the following formula. The copolymers are used as a photoresist material suitable for deep uv process so that high sensitivity and resolution can be obtained. In addition, ultrafine circuits can be formed and an exceptional improvement in PED stability can be accomplished by use of the photoresist.
    Type: Grant
    Filed: March 13, 1997
    Date of Patent: April 18, 2000
    Assignee: Hyundai Electronics Industries Co., Ltd.
    Inventors: Jin Baek Kim, Min Ho Jung, Jong Ho Cheong