Patents by Inventor Young-Kook Koh

Young-Kook Koh 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 for manufacturing ferritic lightweight steel and ferritic lightweight steel using same
    Patent number: 11952647
    Abstract: There is provided a ferritic lightweight steel which contains 2.0 to 3.0 wt % manganese (Mn), 5.0 to 6.0 wt % aluminum (Al) and 0.1 to 0.3 wt % carbon (C) and has a tensile strength of 900 MPa to 1,108 MPa. The lightweight steel includes ferrite-austenite dual grains as a result of performing low-temperature tempering-induced partitioning (LTP) at 300° C. for 10 minutes after isothermal annealing.
    Type: Grant
    Filed: November 11, 2021
    Date of Patent: April 9, 2024
    Assignee: INDUSTRY-ACADEMIC COOPERATION FOUNDATION GYEONGSANG NATIONAL UNIVERSITY
    Inventors: Jae Bok Seol, Hyo Ju Bae, Kwang Gyu Koh, Jung Gi Kim, Hyo Kyung Sung, Young Kook Lee
  • Enantiomerically pure binaphthol derivatives and method for preparing the same
    Patent number: 10059659
    Abstract: The present invention relates to compounds 1, 1a (S-enantiomer) and 1b (R-enantiomer) of the following formula 1, and a method for preparing the same. [formula 1] The novel compound of the formula 1 is used as an important intermediate for preparing compounds 6, 6a (S-enantiomer) and 6b (R-enantiomer) of the following formula 6, which are 2,2?-binaphthol-3-aldehyde derivatives. Also, the present invention provides a method for preparing the compound of formula 1 with a very safe method at low cost.
    Type: Grant
    Filed: December 13, 2011
    Date of Patent: August 28, 2018
    Assignee: AMINOLOGICS CO. LTD.
    Inventors: Rae Kyu Chang, Yun Soo Ahn, Heejung Jung, Hyerim Ga, Juwan Maeng, Young-Kook Koh, Young Hee Lee, Kwang Jae Lee, Joonseo Kim, Hyunil Lee, Heungsik Yoon
  • Synthetic method of enantiomerically pure 2,2?-dihydroxy-1,1?-binaphthyl-3-carboxylic acid
    Patent number: 9725391
    Abstract: The present invention relates to a method for preparing enantiomerically pure compounds 1a and 1b of the following formula 1 from racemic compound 1 of the following formula 1. [formula 1] The compounds 1a and 1b of the above formula 1 respectively are important intermediates for a process for preparing the respective compounds 2a and 2b of the following formula 2, which are 2,2?-binaphthol-3-aldehyde derivatives. The following compounds 2a and 2b are useful for preparing enantiomerically pure amino acids. The present invention provides a method for preparing the above compounds 1a and 1b very conveniently and economically, and suitably for mass production.
    Type: Grant
    Filed: November 24, 2011
    Date of Patent: August 8, 2017
    Assignee: Aminologics Co., Ltd.
    Inventors: Hyunil Lee, Heungsik Yoon, Young Hee Lee, Heejung Jung, Young-Kook Koh
  • SYNTHETIC METHOD OF ENANTIOMERICALLY PURE 2,2'-DIHYDROXY-1,1'-BINAPHTHYL-3-CARBOXYLIC ACID
    Publication number: 20140142336
    Abstract: The present invention relates to a method for preparing enantiomerically pure compounds 1a and 1b of the following formula 1 from racemic compound 1 of the following formula 1. [formula 1] The compounds 1a and 1b of the above formula 1 respectively are important intermediates for a process for preparing the respective compounds 2a and 2b of the following formula 2, which are 2,2?-binaphthol-3-aldehyde derivatives. The following compounds 2a and 2b are useful for preparing enantiomerically pure amino acids. The present invention provides a method for preparing the above compounds 1a and 1b very conveniently and economically, and suitably for mass production.
    Type: Application
    Filed: November 24, 2011
    Publication date: May 22, 2014
    Applicant: AMINOLOGICS CO., LTD.
    Inventors: Hyunil Lee, Heungsik Yoon, Young Hee Lee, Heejung Jung, Young-Kook Koh
  • ENANTIOMERICALLY PURE BINAPHTHOL DERIVATIVES AND METHOD FOR PREPARING THE SAME
    Publication number: 20140012038
    Abstract: The present invention relates to compounds 1, 1a (S-enantiomer) and 1b (R-enantiomer) of the following formula 1, and a method for preparing the same. [formula 1] The novel compound of the formula 1 is used as an important intermediate for preparing compounds 6, 6a (S-enantiomer) and 6b (R-enantiomer) of the following formula 6, which are 2,2?-binaphthol-3-aldehyde derivatives. Also, the present invention provides a method for preparing the compound of formula 1 with a very safe method at low cost.
    Type: Application
    Filed: December 13, 2011
    Publication date: January 9, 2014
    Applicant: Aminologics Co., Ltd.
    Inventors: Rae Kyu Chang, Yun Soo Ahn, Heejung Jung, Hyerim Ga, Juwan Maeng, Young-Kook Koh, Young Hee Lee, Kwang Jae Lee, Joonseo Kim, Hyunil Lee