Patents by Inventor Yonggyun Cho

Yonggyun 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).

  • Optical film
    Patent number: 8597551
    Abstract: Provided is an optical film using a cellulose derivative, which is used in image display devices such as liquid-crystal display devices. A liquid-crystal display device with a polarizing plate using the optical film has an excellent viewing angle property. More particularly, the present invention relates to an optical film made of a cellulose ester resin, a portion of hydrogen atoms of hydroxyl groups of which is substituted with two or more substituent groups.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: December 3, 2013
    Assignee: SK Innovation Co., Ltd.
    Inventors: Kiyup Kim, Yonggyun Cho, Sangyeup Lee, Wonyeob Kim, Wonseok Jang, Myounglae Kim
  • Optical compensation film with hybrid arrangement of nematic liquid crystals consisting of connected mesogens with an angle and the method of manufacturing the same
    Patent number: 8570472
    Abstract: Provided are an optical compensation film and a method for producing the same. The optical compensation film includes a nematic liquid crystal compound including a compound having at least two mesogens linked to each other with a constant angle, and has hybrid alignment in which the alignment of the liquid crystal compound varies gradually along the thickness direction.
    Type: Grant
    Filed: February 25, 2010
    Date of Patent: October 29, 2013
    Assignee: SK Innovation Co., Ltd.
    Inventors: Yonggyun Cho, Kwangjin Chung, Cholho Lee, Yooseock Hwang, Hyukjun Kim, Kiyup Kim, Sungho Son, Kibeom Kim
  • Optical Film
    Publication number: 20120161086
    Abstract: Provided is an optical film using a cellulose derivative, which is used in image display devices such as liquid-crystal display devices. A liquid-crystal display device with a polarizing plate using the optical film has an excellent viewing angle property. More particularly, the present invention relates to an optical film made of a cellulose ester resin, a portion of hydrogen atoms of hydroxyl groups of which is substituted with two or more substituent groups.
    Type: Application
    Filed: December 22, 2011
    Publication date: June 28, 2012
    Applicant: SK INNOVATION CO., LTD.
    Inventors: Kiyup Kim, Yonggyun Cho, Sangyeup Lee, Wonyeob Kim, Wonseok Jang, Myounglae Kim
  • OPTICAL COMPENSATION FILM WITH HYBRID ARRANGEMENT OF NEMATIC LIQUID CRYSTALS CONSISTING OF CONNECTED MESOGENS WITH AN ANGLE AND THE METHOD OF MANUFACTURING THE SAME
    Publication number: 20110317101
    Abstract: Provided are an optical compensation film and a method for producing the same. The optical compensation film includes a nematic liquid crystal compound including a compound having at least two mesogens linked to each other with a constant angle, and has hybrid alignment in which the alignment of the liquid crystal compound varies gradually along the thickness direction.
    Type: Application
    Filed: February 25, 2010
    Publication date: December 29, 2011
    Applicant: SK INNOVATION CO., LTD.
    Inventors: Yonggyun Cho, Kwangjin Chung, Cholho Lee, Yooseock Hwang, Hyukjun Kim, Kiyup Kim, Sungho Son, Kibeom Kim