Patents by Inventor Jongpil Chun

Jongpil Chun 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).

  • Process for preparing optically pure (S)-3-hydroxy-&ggr;-butyrolactone
    Patent number: 6713290
    Abstract: The present invention relates to a process for preparing optically pure (S)-3-hydroxy-&ggr;-butyrolactone expressed by the following Formula 1 and more particularly, to a process that enables preparing optically pure (S)-3-hydroxy-&ggr;-butyrolactone economically in large quantities, by: (a) Preparing &agr;-(1,4) linked oligosaccharide with adequate sugar distribution by reacting starch which is easily available from natural product with enzyme under a specific condition; and (b) Performing oxidation and cyclization sequentially under a specific condition.
    Type: Grant
    Filed: September 6, 2001
    Date of Patent: March 30, 2004
    Assignee: Samsung Fine Chemicals Co., Ltd.
    Inventors: Young Mi Park, Jongpil Chun, Yik-haeng Cho, Kyoung Rok Roh, Hosung Yu, Dae Hwang, II
  • Process for preparing optically pure (S)-3-hydroxy-gamma-butyrolactone
    Publication number: 20020048796
    Abstract: The present invention relates to a process for preparing optically pure (S)-3-hydroxy-&ggr;-butyrolactone expressed by the following Formula 1 and more particularly, to a process that enables preparing optically pure (S)-3-hydroxy-&ggr;-butyrolactone economically in large quantities, by:
    Type: Application
    Filed: September 6, 2001
    Publication date: April 25, 2002
    Applicant: Samsung Fine Chemicals Co., Ltd.
    Inventors: Young Mi Park, Jongpil Chun, Yik-Haeng Cho, Kyoung Rok Roh, Hosung Yu, Dae II Hwang
  • Continuous process for preparing optically pure (s)-3,4-dihydroxybutyric acid derivatives
    Patent number: 6288272
    Abstract: The present invention relates to a continuous process for preparing optically pure (S)-3,4-dihydroxybutyric acid derivatives expressed by the following Formula 1 and more particularly, to the continuous process which enables preparing optically pure (S)-3,4-dihydroxybutyric acid derivatives economically in large quantities, by: (a) Preparing &agr;-(1,4) linked oligosaccharide having adequate sugar distribution by reacting amylopectin which is easily available from natural product with enzyme under a specific condition; and (b) Performing oxidatioin by running basic anion exchange resin with an oxidant to give (S)-3,4-dihydroxybutyric acid-anion exchange resin complex, dissociating the (S)-3,4-dihydroxybutyric acid from anion exchange resin complex and esterification sequentially under a specific condition.  wherein Represents linear or branched alkyl group with 1˜5 carbon atoms.
    Type: Grant
    Filed: July 23, 1999
    Date of Patent: September 11, 2001
    Assignee: Samsung Fine Chemicals Co., Ltd.
    Inventors: Kyoung Rok Roh, Jongpil Chun, Yik-haeng Cho, Young Mi Park, Hosung Yu, Dae Il Hwang
  • Continuous process for preparing optically pure (S)-3-hydroxy-&ggr;-butyrolactone
    Patent number: 6251642
    Abstract: The present invention relates to a continuous process for preparing optically pure (S)-3-hydroxy-&ggr;-butyrolactone expressed by the following Formula 1 and more particularly, to a process which enables preparing optically pure (S)-3-hydroxy-&ggr;-butyrolactone economically in large quantities, by: (a) Preparing &agr;-(1,4) linked oligosaccharide with adequate sugar distribution by reacting amylopectin which is easily available from natural product with enzyme under a specific condition; and (b) Performing oxidation, esterification and cyclization sequentially under a specific condition.
    Type: Grant
    Filed: July 23, 1999
    Date of Patent: June 26, 2001
    Assignee: Samsung Fine Chemicals, Co., Ltd.
    Inventors: Jongpil Chun, Yik-haeng Cho, Kyoung Rok Roh, Young Mi Park, Hosung Yu, Dae Hwang, II
  • Process for preparing optically pure(S)-3,4-dihydroxybutyric acid derivatives
    Patent number: 6221639
    Abstract: The present invention relates to a process for preparing optically pure (S)-3,4-dihydroxybutyric acid derivatives expressed by the following Formula 1 and more particularly, to a process that enables preparing optically pure (S)-3,4-dihydroxybutyric acid derivatives economically in large quantities, by: (a) Preparing &agr;-(1,4)-linked oligosaccharide with adequate sugar distribution by reacting amylopectin which is easily available from natural product with enzyme under a specific condition; and (b) Performing oxidation and esterification sequentially under a specific condition. wherein, R represents linear or branched alkyl group with 1˜5 carbon atoms.
    Type: Grant
    Filed: July 23, 1999
    Date of Patent: April 24, 2001
    Assignee: Samsung Fine Chemicals Co., Ltd.
    Inventors: Yik-haeng Cho, Jongpil Chun, Young Mi Park, Kyoung Rok Roh, Hosung Yu, Dae Il Hwang
  • Process for preparing optically pure (S)-3-hydroxy-.gamma.-butyrolactone
    Patent number: 6124122
    Abstract: The present invention relates to a process for preparing optically pure (S)-3-hydroxy-.gamma.-butyrolactone expressed by the following Formula 1 and more particularly, to a process that enables preparing optically pure (S)-3-hydroxy-.gamma.-butyrolactone economically in large quantities, by:(a) Preparing .alpha.-(1,4) linked oligosaccharide with adequate sugar distribution by reacting amylopectin which is easily available from natural product with enzyme under a specific condition; and(b) Performing oxidation, esterification and cyclization sequentially under a specific condition.
    Type: Grant
    Filed: July 23, 1999
    Date of Patent: September 26, 2000
    Assignee: Samsung Fine Chemicals Co., Ltd.
    Inventors: Jongpil Chun, Yik-haeng Cho, Young Mi Park, Kyoung Rok Roh, Hosung Yu, Dae Il Hwang