Patents by Inventor Chang Il Seo

Chang Il Seo 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).

  • Microorganism producing O-acetyl-homoserine and the method of producing O-acetyl-homoserine using the microorganism
    Patent number: 8283152
    Abstract: Disclosed is a strain of Escherichia sp., capable of producing O-acetyl homoserine in high yield, with the introduction and enhancement therein of the activity of: homoserine acetyl transferase, aspartokinase and homoserine dehydrogenase; and at least one enzyme selected from a group consisting of phosphoenolpyruvate carboxylase, aspartate aminotransferase and aspartate semi-aldehyde dehydrogenase. Also, a method of producing O-acetyl homoserine using the strain is provided.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: October 9, 2012
    Assignee: CJ Cheiljedang Corporation
    Inventors: So Young Kim, Yong Uk Shin, In Kyung Heo, Hyun Ah Kim, Chang Il Seo, Ju Eun Kim, Sung Kwang Son, Sang Mok Lee, Sung Hoo Jhon, Han Jin Lee, Kwang Ho Na
  • Method for Increasing Methionine Productivity Using a Mixture of Methyl Mercaptan and Dimethyl Sulfide
    Publication number: 20120123158
    Abstract: The present invention relates to a method for increasing L-methionine productivity and organic acid productivity. More particularly, the present invention relates to a method which involves adding a mixture containing methyl mercaptan and dimethyl sulfide at a appropriate ratio to O-acetyl homoserine or O-succinyl homoserine and to an enzyme having an activity of converting methionine precursor into L-methionine, so as to perform an enzyme reaction, to thereby improve the conversion rate of L-methionine and organic acid from the L-methionine precursor, and thus increasing L-methionine yield as compared to conventional method.
    Type: Application
    Filed: February 26, 2010
    Publication date: May 17, 2012
    Applicant: CJ CHEILJEDANG CORPORATION
    Inventors: So Young Kim, Yong Uk Shin, In Kyung Heo, Hyun Ah Kim, Ju Eun Kim, Chang Il Seo, Sung Kwang Son, Sang Mok Lee, Sung Hoo Jhon, Han Jin Lee, Kwang Ho Na, Il Chul Kim
  • MICROORGANISM PRODUCING O-ACETYL-HOMOSERINE AND THE METHOD OF PRODUCING O-ACETYL-HOMOSERINE USING THE MICROORGANISM
    Publication number: 20110053252
    Abstract: Disclosed herein are a microorganism strain capable of producing the L-methionine precursor O-acetyl homoserine in high yield and a method of producing O-acetyl homoserine using the same. The microorganism strain is a strain of Escherichia sp. in which an acetyl-CoA synthase gene (acs) and/or a pantothenate kinase gene (coA) encoding a pantothenate kinase gene refractory to feedback inhibition by CoA is introduced and expressed.
    Type: Application
    Filed: August 28, 2009
    Publication date: March 3, 2011
    Applicant: CJ CHEILJEDANG CORPORATION
    Inventors: So Young Kim, Yong Uk Shin, In Kyung Heo, Hyun Ah Kim, Chang Il Seo, Ju Eun Kim, Sung Kwang Son, Sang Mok Lee, Sung Hoo Jhon, Han Jin Lee, Kwang Ho Na
  • MICROORGANISM PRODUCING O-ACETYL-HOMOSERINE AND THE METHOD OF PRODUCING O-ACETYL-HOMOSERINE USING THE MICROORGANISM
    Publication number: 20110053253
    Abstract: Disclosed is a strain of Escherichia sp., capable of producing O-acetyl homoserine in high yield, with the introduction and enhancement therein of the activity of: homoserine acetyl transferase, aspartokinase and homoserine dehydrogenase; and at least one enzyme selected from a group consisting of phosphoenolpyruvate carboxylase, aspartate aminotransferase and aspartate semi-aldehyde dehydrogenase. Also, a method of producing O-acetyl homoserine using the strain is provided.
    Type: Application
    Filed: August 28, 2009
    Publication date: March 3, 2011
    Applicant: CJ CHEILJEDANG CORPORATION
    Inventors: So Young Kim, Yong Uk Shin, In Kyung Heo, Hyun Ah Kim, Chang Il Seo, Ju Eun Kim, Sung Kwang Son, Sang Mok Lee, Sung Hoo Jhon, Han Jin Lee, Kwang Ho Na
  • Microorganism producing L-methionine precursor and the method of producing L-methionine precursor using the microorganism
    Patent number: 7851180
    Abstract: The present invention relates to a microorganism producing L-methionine precursor, O-succinylhomoserine, and a method of producing L-methionine precursor using the microorganism,
    Type: Grant
    Filed: April 4, 2008
    Date of Patent: December 14, 2010
    Assignee: CJ Cheiljedang Corporation
    Inventors: Young Uk Shin, So Young Kim, Jin Sook Chang, Young Wook Cho, Han Jin Lee, In Kyung Heo, Kwang Ho Na, Chang Il Seo, Chul Ha Kim, Hye Won Um
  • MICROORGANISM PRODUCING L-METHIONINE PRECURSOR AND THE METHOD OF PRODUCING L-METHIONINE PRECURSOR USING THE MICROORGANISM
    Publication number: 20090253186
    Abstract: The present invention relates to a microorganism producing L-methionine precursor, O-acetylhomoserine, and a method of producing L-methionine precursor using the microorganism.
    Type: Application
    Filed: April 4, 2008
    Publication date: October 8, 2009
    Applicant: CJ CHEILJEDANG CORPORATION
    Inventors: Chul Ha KIM, So Young KIM, Young Uk SHIN, Hye Won UM, Jin Sook CHANG, Young Wook CHO, Han Jin LEE, In Kyung HEO, Chang Il SEO, Kwang Ho NA
  • MICROORGANISM PRODUCING L-METHIONINE PRECURSOR AND THE METHOD OF PRODUCING L-METHIONINE PRECURSOR USING THE MICROORGANISM
    Publication number: 20090253187
    Abstract: The present invention relates to a microorganism producing L-methionine precursor, O-succinylhomoserine, and a method of producing L-methionine precursor using the microorganism,
    Type: Application
    Filed: April 4, 2008
    Publication date: October 8, 2009
    Applicant: CJ CHEILJEDANG CORPORATION
    Inventors: Young Uk SHIN, So Young KIM, Jin Sook CHANG, Young Wook CHO, Han Jin LEE, In Kyung HEO, Kwang Ho NA, Chang Il SEO, Chul Ha KIM, Hye Won UM