Patents by Inventor Kwang Ho Na

Kwang Ho Na 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: 10446715
    Abstract: Disclosed herein is a semiconductor device. The semiconductor device includes a substrate, a first conductive type semiconductor layer disposed over the substrate, an active layer disposed over the first conductive type semiconductor layer, and a second conductive type semiconductor layer disposed over the active layer. The first conductive type semiconductor layer includes a first layer, a second layer and a third layer having different composition ratios of indium (In). The first semiconductor layer is disposed close to the active layer. The second semiconductor layer is disposed under the first semiconductor layer. The third semiconductor layer is disposed under the second semiconductor layer. In content is reduced from the active layer to the third semiconductor layer, and In content of the third semiconductor layer may be 5% or more to 10% or less of that of the active layer.
    Type: Grant
    Filed: November 2, 2017
    Date of Patent: October 15, 2019
    Assignee: LG INNOTEK CO., LTD.
    Inventors: Kwang Sun Baek, Jong Ho Na, Dae Seob Han, Jung Hyun Hwang
  • Publication number: 20190259913
    Abstract: Disclosed herein is a semiconductor device. The semiconductor device includes a substrate, a first conductive type semiconductor layer disposed over the substrate, an active layer disposed over the first conductive type semiconductor layer, and a second conductive type semiconductor layer disposed over the active layer. The first conductive type semiconductor layer includes a first layer, a second layer and a third layer having different composition ratios of indium (In). The first semiconductor layer is disposed close to the active layer. The second semiconductor layer is disposed under the first semiconductor layer. The third semiconductor layer is disposed under the second semiconductor layer. In content is reduced from the active layer to the third semiconductor layer, and In content of the third semiconductor layer may be 5% or more to 10% or less of that of the active layer.
    Type: Application
    Filed: November 2, 2017
    Publication date: August 22, 2019
    Applicant: LG INNOTEK CO., LTD.
    Inventors: Kwang Sun BAEK, Jong Ho NA, Dae Seob HAN, Jung Hyun HWANG
  • Patent number: 10344287
    Abstract: The present invention relates to a recombinant microorganism producing quinolinic acid, more particularly, a microorganism producing quinolinic acid and having attenuated activity or eliminated activity of a protein having a sequence of SEQ ID NO: 1 and a method of producing quinolinic acid by using the recombinant microorganism.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: July 9, 2019
    Assignee: CJ CHEILJEDANG CORPORATION
    Inventors: Jin Sook Chang, Ju Eun Kim, So Young Kim, Kwang Ho Na, Yong Uk Shin, Jae Min Lee, Jae Hee Lee, In Kyung Heo
  • Patent number: 10221434
    Abstract: The present invention relates to a polypeptide which is resistant to feedback inhibition by methionine and has an activity of homoserine O-succinyltransferase, a microorganism for producing O-succinylhomoserine which expresses the polypeptide, and a method for producing O-succinylhomoserine using the same.
    Type: Grant
    Filed: October 22, 2014
    Date of Patent: March 5, 2019
    Assignee: CJ CHEILJEDANG CORPORATION
    Inventors: Chang Il Seo, So Young Kim, Yong Uk Shin, Kwang Ho Na, Hye Won Um, In Kyung Heo
  • Patent number: 10096700
    Abstract: A power semiconductor device includes a semiconductor substrate, trench structures comprising a first, a second, a third and a fourth trench structure formed in the substrate, a second conductivity type body region formed between the trench structures, a first conductivity type source region formed in the second conductivity type body region, and an emitter electrode and a gate pad formed over the substrate, wherein each trench structure includes a top electrode and a bottom electrode, and each top electrode is insulated from the corresponding bottom electrode, and wherein the first trench structure is symmetric to the fourth trench structure, and the second trench structure is symmetric to the third trench structure, and wherein the first trench structure is not identical to the second trench structure, and wherein no first conductivity type source region is formed to be adjacent to the second trench structure and the third trench structure.
    Type: Grant
    Filed: May 4, 2016
    Date of Patent: October 9, 2018
    Assignee: Magnachip Semiconductor, Ltd.
    Inventors: Kwang Ho Na, Seung Wook Song, Yong Hun Kim
  • Publication number: 20170159059
    Abstract: The present invention relates to a recombinant microorganism producing quinolinic acid, more particularly, a microorganism producing quinolinic acid and having attenuated activity or eliminated activity of a protein having a sequence of SEQ ID NO: 1 and a method of producing quinolinic acid by using the recombinant microorganism.
    Type: Application
    Filed: June 30, 2015
    Publication date: June 8, 2017
    Applicant: CJ CHEILJEDANG CORPORATION
    Inventors: Jin Sook CHANG, Ju Eun KIM, So Young KIM, Kwang Ho NA, Yong Uk SHIN, Jae Min LEE, Jae Hee LEE, In Kyung HEO
  • Publication number: 20170137853
    Abstract: The present disclosure relates to a microorganism producing O-acetylhomoserine with high efficiency and a method for producing O-acetylhomoserine and L-methionine using the microorganism. The present disclosure provides a microorganism producing O-acetylhomoserine having an enhanced activity of a protein which is predicted to export O-acetylhomoserine, and a method for producing O-acetylhomoserine and L-methionine using the microorganism.
    Type: Application
    Filed: June 5, 2015
    Publication date: May 18, 2017
    Inventors: Jee Yeon BAE, Hyun Ah KIM, Yong Uk SHIN, So Young KIM, Sang Kyoum KIM, Kwang Ho NA, Ju Hee SEO, Sung Kwang SON, Hye Ryun YOO, Jin Geun CHOI
  • Publication number: 20170101655
    Abstract: Disclosed is a microorganism of Escherichia sp. producing O-acetyl homoserine, and a method of producing O-acetyl homoserine in high yield using the microorganism.
    Type: Application
    Filed: June 22, 2015
    Publication date: April 13, 2017
    Inventors: Hyun Ah KIM, Ju Hee SEO, Yong Uk SHIN, So Young KIM, Sang Kyoum KIM, Kwang Ho NA, Jee Yeon BAE, Sung Kwang SON, Hye Ryun YOO, Jin Geun CHOI
  • Publication number: 20170069741
    Abstract: A power semiconductor device includes a semiconductor substrate, trench structures comprising a first, a second, a third and a fourth trench structure formed in the substrate, a second conductivity type body region formed between the trench structures, a first conductivity type source region formed in the second conductivity type body region, and an emitter electrode and a gate pad formed over the substrate, wherein each trench structure includes a top electrode and a bottom electrode, and each top electrode is insulated from the corresponding bottom electrode, and wherein the first trench structure is symmetric to the fourth trench structure, and the second trench structure is symmetric to the third trench structure, and wherein the first trench structure is not identical to the second trench structure, and wherein no first conductivity type source region is formed to be adjacent to the second trench structure and the third trench structure.
    Type: Application
    Filed: May 4, 2016
    Publication date: March 9, 2017
    Applicant: Magnachip Semiconductor, Ltd.
    Inventors: Kwang Ho NA, Seung Wook SONG, Yong Hun KIM
  • Publication number: 20170016037
    Abstract: The present invention relates to a method for enhancing the solubility of methionine. More particularly, the present invention relates to a method for increasing the solubility of methionine, in which mineral and sulfuric acid are added at an appropriate ratio to enhance the methionine solubility, thereby overcoming the problem of low solubility of methionine in water.
    Type: Application
    Filed: September 30, 2016
    Publication date: January 19, 2017
    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
  • Publication number: 20160304920
    Abstract: The present invention relates to a polypeptide which is resistant to feedback inhibition by methionine and has an activity of homoserine O-succinyltransferase, a microorganism for producing O-succinylhomoserine which expresses the polypeptide, and a method for producing O-succinylhomoserine using the same.
    Type: Application
    Filed: October 22, 2014
    Publication date: October 20, 2016
    Inventors: Chang Il SEO, So Young KIM, Yong Uk SHIN, Kwang Ho NA, Hye Won UM, In Kyung HEO
  • Patent number: 9297030
    Abstract: A method for the preparation of nicotinic acid, which includes the step of obtaining a culture solution containing quinolinic acid by incubating a microorganism having an ability to produce quinolinic acid, and the step of adding an acid to the culture solution and conducting a decarboxylation reaction.
    Type: Grant
    Filed: January 16, 2012
    Date of Patent: March 29, 2016
    Assignee: CJ CHEILJEDANG CORPORATION
    Inventors: So Young Kim, Yong Uk Shin, In Kyung Heo, Ju Eun Kim, Sung Kwang Son, Chang Il Seo, Hyun Ah Kim, Han Jin Lee, Kwang Ho Na, Jee Yeon Bae
  • Patent number: 9290743
    Abstract: To produce quinolinate effectively, a L-aspartate oxidase variant that the feedback regulation by nicotinic acid or NAD is released, and a microorganism including the L-aspartate oxidase variant are provided. Quinolinate may be effectively produced by culturing of the microorganism including the L-aspartate oxidase variant.
    Type: Grant
    Filed: July 25, 2014
    Date of Patent: March 22, 2016
    Assignee: CJ CHEILJEDANG CORP.
    Inventors: So Young Kim, Yong Uk Shin, In Kyung Heo, Ju Eun Kim, Kwang Ho Na, Chang Il Seo, Sung Kwang Son, Jae Hee Lee
  • Patent number: 9127257
    Abstract: The present invention relates to a polypeptide that is modified to have homoserine O-acetyltransferase activity, and in particular, the present invention provides a modified polypeptide having homoserine O-acetyltransferase activity, in which the amino acid at position 111 of a polypeptide having homoserine succinyltransferase activity is substituted with other amino acid.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: September 8, 2015
    Assignee: CJ CHEILJEDANG CORPORATION
    Inventors: So Young Kim, Yong Uk Shin, Chang Il Seo, In Kyung Heo, Ju Eun Kim, Hyun Ah Kim, Han Jin Lee, Kwang Ho Na, Sung Kwang Son
  • Patent number: 9080155
    Abstract: The present invention relates to a novel protein having O-acetylhomoserine sulfhydrylase activity, a mutant protein thereof, a polynucleotide encoding the same, a recombinant vector comprising the polynucleotide, a microorganism transformed with the recombinant vector, and a method for producing methionine or acetic acid using the protein. The production method of the present invention has the advantage of producing L-methionine and acetic acid cost-effectively through having higher conversion rate and reduced reaction time compared to the existing methods, and it can minimize the amount of enzyme homogenate added when using the mutant protein, thereby easily producing L-methionine and acetic acid at high yield.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: July 14, 2015
    Assignee: CJ CHEILJEDANG CORPORATION
    Inventors: So Young Kim, Yong Uk Shin, Chang Il Seo, Sung Kwang Son, In Kyung Heo, Han Jin Lee, Ju Eun Kim, Hyun Ah Kim, Jee Yeon Bae, Kwang Ho Na
  • Patent number: 9024063
    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: Grant
    Filed: February 26, 2010
    Date of Patent: May 5, 2015
    Assignee: 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
  • Patent number: 9005952
    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: Grant
    Filed: April 4, 2008
    Date of Patent: April 14, 2015
    Assignee: 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
  • Publication number: 20150031093
    Abstract: To produce quinolinate effectively, a L-aspartate oxidase variant that the feedback regulation by nicotinic acid or NAD is released, and a microorganism including the L-aspartate oxidase variant are provided. Quinolinate may be effectively produced by culturing of the microorganism including the L-aspartate oxidase variant.
    Type: Application
    Filed: July 25, 2014
    Publication date: January 29, 2015
    Inventors: So Young KIM, Yong Uk SHIN, In Kyung HEO, Ju Eun KIM, Kwang Ho NA, Chang Il SEO, Sung Kwang SON, Jae Hee LEE
  • Publication number: 20140315263
    Abstract: A method for the preparation of nicotinic acid, which includes the step of obtaining a culture solution containing quinolinic acid by incubating a microorganism having an ability to produce quinolinic acid, and the step of adding an acid to the culture solution and conducting a decarboxylation reaction.
    Type: Application
    Filed: January 16, 2012
    Publication date: October 23, 2014
    Applicant: CJ CHEILJEDANG CORPORATION
    Inventors: So Young Kim, Yong Uk Shin, In Kyung Heo, Ju Eun Kim, Sung Kwang Son, Chang II Seo, Hyun Ah Kim, Han Jin Lee, Kwang Ho Na, Jee Yeon Bae
  • Patent number: 8609396
    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 (coaA) encoding a pantothenate kinase gene refractory to feedback inhibition by CoA is introduced and expressed.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: December 17, 2013
    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