Patents by Inventor Sung Ha Woo

Sung Ha Woo 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).

  • Patent number: 7910268
    Abstract: A method for fabricating a fine pattern in a photomask includes forming a light shielding layer over a substrate; forming a first resist layer pattern over the light shielding layer to expose the light shielding layer with a first critical dimension; forming a groove by etching the portion of the light shielding layer exposed by the first resist layer pattern to a first depth; exposing an upper surface of the light shielding layer by removing the first resist layer pattern; forming a second resist layer pattern over the exposed upper surface of the light shielding layer so that a bottom of the groove is partially exposed; and forming a light shielding layer pattern by etching the portion of the light shielding layer exposed by the second resist layer pattern to a second depth so that the substrate is exposed with a second critical dimension which is smaller than the first critical dimension.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: March 22, 2011
    Assignee: Hynix Semiconductor Inc.
    Inventor: Sung Ha Woo
  • Patent number: 7846621
    Abstract: A mask for extreme ultra violet lithography (EUVL) and a method of fabricating the same, and a wafer exposure method using the same. According to a method of fabricating the mask, a light reflective layer pattern is formed on a transparent substrate to reflect extreme ultraviolet light. The extreme ultraviolet light is incident to and transmitted by the transparent substrate. A light absorption layer on the transparent substrate is formed to fill between the light reflective layer patterns and absorb the extreme ultraviolet light.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: December 7, 2010
    Assignee: Hynix Semiconductor Inc.
    Inventor: Sung Ha Woo
  • Publication number: 20090263731
    Abstract: A method for fabricating a fine pattern in a photomask includes forming a light shielding layer over a substrate; forming a first resist layer pattern over the light shielding layer to expose the light shielding layer with a first critical dimension; forming a groove by etching the portion of the light shielding layer exposed by the first resist layer pattern to a first depth; exposing an upper surface of the light shielding layer by removing the first resist layer pattern; forming a second resist layer pattern over the exposed upper surface of the light shielding layer so that a bottom of the groove is partially exposed; and forming a light shielding layer pattern by etching the portion of the light shielding layer exposed by the second resist layer pattern to a second depth so that the substrate is exposed with a second critical dimension which is smaller than the first critical dimension.
    Type: Application
    Filed: December 30, 2008
    Publication date: October 22, 2009
    Applicant: HYNIX SEMICONDUCTOR INC.
    Inventor: Sung Ha Woo
  • Publication number: 20090111032
    Abstract: A mask for extreme ultra violet lithography (EUVL) and a method of fabricating the same, and a wafer exposure method using the same. According to a method of fabricating the mask, a light reflective layer pattern is formed on a transparent substrate to reflect extreme ultraviolet light. The extreme ultraviolet light is incident to and transmitted by the transparent substrate. A light absorption layer on the transparent substrate is formed to fill between the light reflective layer patterns and absorb the extreme ultraviolet light.
    Type: Application
    Filed: March 31, 2008
    Publication date: April 30, 2009
    Applicant: HYNIX SEMICONDUCTOR INC.
    Inventor: Sung Ha Woo