Patents by Inventor Joo Hyuck LEE

Joo Hyuck LEE 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).

  • Publication number: 20210051785
    Abstract: A switching driving circuit includes a switch configured to switch a current supplied to a target circuit, a sensing resistor connected to the switch, a controller configured to control the switch by comparing a sensing voltage applied to the sensing resistor with a reference voltage, and a compensation circuit configured to regulate the reference voltage based on an amount of variation of an input voltage input into the target circuit and an output voltage output from the target circuit.
    Type: Application
    Filed: April 15, 2020
    Publication date: February 18, 2021
    Applicant: MagnaChip Semiconductor, Ltd.
    Inventors: Jang Hyuck LEE, Joo Han YOON, Byoung Kwon AN
  • Publication number: 20210021191
    Abstract: An integration circuit is provided. The integration circuit includes a current source, a capacitor connected in series with the current source, a voltage source bias connected in series with the capacitor, a switch configured to connect a first node between the current source and the capacitor and a second node between the capacitor and the voltage source bias; and a switch control logic unit configured to control an on/off operation of the switch, wherein an integration operation is performed by the current source and the capacitor.
    Type: Application
    Filed: March 26, 2020
    Publication date: January 21, 2021
    Applicant: MagnaChip Semiconductor Ltd.
    Inventors: Jang Hyuck LEE, Joo Han YOON, Byoung Kwon AN, Jay LEE
  • Publication number: 20200390842
    Abstract: The present invention relates to a composition comprising natural plant extracts for alleviating inflammation caused by yellow dust and fine particulate, wherein the plant extracts of the present invention inhibit a production of NO caused by the yellow dust and fine particulate and a production of inflammatory cytokines, thus having an excellent effect on preventing or alleviating skin inflammation caused by the yellow dust, fine particulate and other harmful substances.
    Type: Application
    Filed: June 19, 2020
    Publication date: December 17, 2020
    Inventors: Jae Hun Kim, Seung Ki Lee, Joo Hyuck Lim, Yeon Sook Kim, Won Kang Moon, Chi Ho Choi, Kwang Jun Yoon, Sung Ho Moon, Sung Hyun Lee, Myeong Hun Yeom, Soo Mi Ahn, Kyoung Wook Kim, Mi Kyung Sung, Young Pyo Jang, Jinju Kim
  • Patent number: 10843173
    Abstract: A ferrite catalyst for oxidative dehydrogenation and a method of preparing the same. The ferrite catalyst is prepared using an epoxide-based sol-gel method, wherein a step of burning includes a first burning step, in which burning is performed at a temperature of 70 to 200° C.; and a second burning step, in which burning is performed after the temperature is raised from a temperature in the range of greater than 200° C. to 250° C. to a temperature in the range of 600 to 900° C.
    Type: Grant
    Filed: January 4, 2018
    Date of Patent: November 24, 2020
    Assignee: LG CHEM, LTD.
    Inventors: Sun Hwan Hwang, Dong Hyun Ko, Jun Han Kang, Kyong Yong Cha, Joo Hyuck Lee, Hyun Seok Nam, Dae Heung Choi, Myung Ji Suh, Ye Seul Hwang, Jun Kyu Han, Sang Jin Han, Seong Min Kim
  • Patent number: 10518250
    Abstract: The present invention relates to a ferrite-based catalyst composite, a method of preparing the same, and a method of preparing butadiene using the same. More particularly, the present invention provides a ferrite-based catalyst composite having a shape that allows effective dispersion of excess heat generated in a butadiene production process and prevention of catalyst damage and side reaction occurrence by reducing direct exposure of a catalyst to heat, a method of preparing the ferrite-based catalyst composite, and a method of preparing butadiene capable of lowering the temperature of a hot spot and reducing generation of Cox by allowing active sites of a catalyst to have a broad temperature gradient (profile) during oxidative dehydrogenation using the ferrite-based catalyst composite, and thus, providing improved process efficiency.
    Type: Grant
    Filed: February 17, 2017
    Date of Patent: December 31, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Dae Heung Choi, Dong Hyun Ko, Kyong Yong Cha, Myung Ji Suh, Ye Seul Hwang, Sun Hwan Hwang, Seong Min Kim, Jun Han Kang, Joo Hyuck Lee, Hyun Seok Nam, Sang Jin Han, Jun Kyu Han
  • Patent number: 10486150
    Abstract: The present invention relates to a catalyst for oxidative dehydrogenation and a method of preparing the same. More particularly, the present invention provides a catalyst for oxidative dehydrogenation allowing oxidative dehydrogenation reactivity to be secured while increasing a first pass yield, and a method of preparing the catalyst.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: November 26, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Sun Hwan Hwang, Dong Hyun Ko, Kyong Yong Cha, Dae Heung Choi, Myung Ji Suh, Ye Seul Hwang, Jun Kyu Han, Seong Min Kim, Jun Han Kang, Joo Hyuck Lee, Hyun Seok Nam, Sang Jin Han
  • Patent number: 10343958
    Abstract: The present invention relates to a catalyst for coating a surface of a porous material and a method of treating the surface of the porous material. More particularly, when the catalyst for coating a surface of a porous material and the method of treating the surface of the porous material of the present invention are used for butadiene synthesis reaction under high gas space velocity and high pressure conditions, heat generation may be easily controlled and differential pressure may be effectively alleviated, thereby providing improved reactant conversion rate and product selectivity.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: July 9, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Myung Ji Suh, Jun Han Kang, Dong Hyun Ko, Seong Min Kim, Hyun Seok Nam, Joo Hyuck Lee, Kyong Yong Cha, Dae Heung Choi, Sang Jin Han, Jun Kyu Han, Sun Hwan Hwang, Ye Seul Hwang
  • Publication number: 20190194603
    Abstract: The present invention relates to Nelumbo nucifera callus having an increased content of gallic acid or an extract thereof and to a method for preparing the same. The Nelumbo nucifera callus extract according to the present invention has an excellent whitening effect by containing a large amount of gallic acid, and thus can be advantageously used as a cosmetic composition.
    Type: Application
    Filed: March 30, 2017
    Publication date: June 27, 2019
    Inventors: Yeon Sook Kim, Jung Yeon Kim, Jae Hun Kim, Hyeong Mi Kim, Jung Soo Bae, Jung Yun Kim, Ju Yeon Kim, Joo Hyuck Lim, Seung Ki Lee, Sung Ho Moon, Shin Jae Chang, Sang Hyun Moh, Jeong Hun Lee, Hyo Hyun Seo, Ji Hong Moh, Soo Yun Kim, Jeong Gon Park
  • Publication number: 20190184388
    Abstract: The present invention relates to a catalyst for oxidative dehydrogenation and a method of preparing the same. More particularly, the present invention provides a catalyst for oxidative dehydrogenation allowing oxidative dehydrogenation reactivity to be secured while increasing a first pass yield, and a method of preparing the catalyst.
    Type: Application
    Filed: December 21, 2016
    Publication date: June 20, 2019
    Inventors: Sun Hwan HWANG, Dong Hyun KO, Kyong Yong CHA, Dae Heung CHOI, Myung Ji SUH, Ye Seul HWANG, Jun Kyu HAN, Seong Min KIM, Jun Han KANG, Joo Hyuck LEE, Hyun Seok NAM, Sang Jin HAN
  • Patent number: 10315969
    Abstract: Provided are a method of preparing a multicomponent bismuth-molybdenum composite metal oxide catalyst, and a multicomponent bismuth-molybdenum composite metal oxide catalyst prepared thereby. According to the preparation method, since the almost same structure as that of a typical quaternary bismuth-molybdenum catalyst may be obtained by performing two-step co-precipitation, i.e., primary and secondary co-precipitation, of metal components constituting the catalyst, the reduction of catalytic activity due to the deformation of the structure of the catalyst may be suppressed.
    Type: Grant
    Filed: June 4, 2015
    Date of Patent: June 11, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Ye Seul Hwang, Dong Hyun Ko, Kyong Yong Cha, Dae Heung Choi, Myung Ji Suh, Jun Han Kang, Joo Hyuck Lee, Hyun Seok Nam, Jun Kyu Han, Sang Jin Han
  • Publication number: 20190134612
    Abstract: A ferrite catalyst for oxidative dehydrogenation and a method of preparing the same. The ferrite catalyst is prepared using an epoxide-based sol-gel method, wherein a step of burning includes a first burning step, in which burning is performed at a temperature of 70 to 200° C.; and a second burning step, in which burning is performed after the temperature is raised from a temperature in the range of greater than 200° C. to 250° C. to a temperature in the range of 600 to 900° C.
    Type: Application
    Filed: January 4, 2018
    Publication date: May 9, 2019
    Inventors: Sun Hwan HWANG, Dong Hyun KO, Jun Han KANG, Kyong Yong CHA, Joo Hyuck LEE, Hyun Seok NAM, Dae Heung CHOI, Myung Ji SUH, Ye Seul HWANG, Jun Kyu HAN, Sang Jin HAN, Seong Min KIM
  • Publication number: 20180290126
    Abstract: Disclosed are a catalyst for oxidative dehydrogenation and a method of preparing the same. More particularly, a catalyst for oxidative dehydrogenation of butene having a high butene conversion rate and superior side reaction inhibition effect and thus having high reactivity and high selectivity for a product by preparing metal oxide nanoparticles and then fixing the prepared metal oxide nanoparticles to a support, and a method of preparing the same are provided.
    Type: Application
    Filed: May 18, 2017
    Publication date: October 11, 2018
    Inventors: Seongmin KIM, Dong Hyun KO, Kyong Yong CHA, Dae Heung CHOI, Myung Ji SUH, Jun Kyu HAN, Sun Hwan HWANG, Jun Han KANG, Joo Hyuck LEE, Hyun Seok NAM, Ye Seul HWANG, Sang Jin HAN
  • Publication number: 20180214854
    Abstract: The present invention relates to a ferrite-based catalyst composite, a method of preparing the same, and a method of preparing butadiene using the same. More particularly, the present invention provides a ferrite-based catalyst composite having a shape that allows effective dispersion of excess heat generated in a butadiene production process and prevention of catalyst damage and side reaction occurrence by reducing direct exposure of a catalyst to heat, a method of preparing the ferrite-based catalyst composite, and a method of preparing butadiene capable of lowering the temperature of a hot spot and reducing generation of Cox by allowing active sites of a catalyst to have a broad temperature gradient (profile) during oxidative dehydrogenation using the ferrite-based catalyst composite, and thus, providing improved process efficiency.
    Type: Application
    Filed: February 17, 2017
    Publication date: August 2, 2018
    Inventors: Dae Heung CHOI, Dong Hyun KO, Kyong Yong CHA, Myung Ji SUH, Ye Seul HWANG, Sun Hwan HWANG, Seong Min KIM, Jun Han KANG, Joo Hyuck LEE, Hyun Seok NAM, Sang Jin HAN, Jun Kyu HAN
  • Publication number: 20180186711
    Abstract: The present invention relates to a catalyst for coating a surface of a porous material and a method of treating the surface of the porous material. More particularly, when the catalyst for coating a surface of a porous material and the method of treating the surface of the porous material of the present invention are used for butadiene synthesis reaction under high gas space velocity and high pressure conditions, heat generation may be easily controlled and differential pressure may be effectively alleviated, thereby providing improved reactant conversion rate and product selectivity.
    Type: Application
    Filed: March 30, 2017
    Publication date: July 5, 2018
    Inventors: Myung Ji SUH, Jun Han KANG, Dong Hyun KO, Seong Min KIM, Hyun Seok NAM, Joo Hyuck LEE, Kyong Yong CHA, Dae Heung CHOI, Sang Jin HAN, Jun Kyu HAN, Sun Hwan HWANG, Ye Seul HWANG
  • Patent number: 9969661
    Abstract: Disclosed are a method of preparing conjugated diene and a device therefor. More particularly, disclosed a method of preparing conjugated diene, wherein generated gas including butadiene is cooled and then water discharged at a lower part is not directly treated as waste water and subjected to byproduct removal and steam-extraction to utilize converted steam, and an installation issue of an existing biological waste water disposal equipment due to an excessive amount of byproducts can be resolved, and a device therefor are disclosed.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: May 15, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Sang Jin Han, Jun Han Kang, Dong Hyun Ko, Hyun Seok Nam, Joo Hyuck Lee, Jun Kyu Han, Myung Ji Suh, Kyong Yong Cha, Dae Heung Choi, Ye Seul Hwang
  • Patent number: 9925525
    Abstract: The present invention relates to a bismuth molybdate-based composite oxide catalyst having a microporous zeolite coating layer on the surface thereof and thus having high selectivity for 1,3-butadiene, a method of preparing the same, and a method of preparing 1,3-butadiene using the same. The catalyst has a microporous zeolite coating layer, and thus enables only gaseous products (light) to selectively pass through the zeolite coating layer, improving selectivity for 1,3-butadiene.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: March 27, 2018
    Assignee: LG CHEM, LTD.
    Inventors: Dae Heung Choi, Dong Hyun Ko, Jun Han Kang, Kyong Yong Cha, Dae Chul Kim, Joo Hyuck Lee, Hyun Seok Nam, Myung Ji Suh, Ye Seul Hwang, Jun Kyu Han, Sang Jin Han
  • Patent number: 9751819
    Abstract: The present invention relates to a method of preparing butadiene. More particularly, the present invention relates to a method of preparing butadiene by feeding butene and oxygen into a reactor containing a composite metal oxide catalyst and performing oxidative dehydrogenation, wherein a mole ratio of the oxygen to the butene is 1.8 to 2.2. In accordance with the present invention, a method of preparing butadiene to secure long-term operation stability by maintaining the intensity of a catalyst despite oxidative dehydrogenation and not to decrease selectivity due to less side reaction is provided.
    Type: Grant
    Filed: November 25, 2015
    Date of Patent: September 5, 2017
    Assignee: LG CHEM, LTD.
    Inventors: Dae Heung Choi, Dong Hyun Ko, Myung Ji Suh, Kyong Yong Cha, Ye Seul Hwang, Jun Han Kang, Hyun Seok Nam, Joo Hyuck Lee, Sang Jin Han, Jun Kyu Han
  • Patent number: 9592496
    Abstract: Disclosed are a catalyst composition for oxidative dehydrogenation and a method of preparing the same. More particularly, disclosed is a catalyst composition comprising a multi-ingredient-based metal oxide catalyst and a mixed metal hydroxide. The catalyst composition and the method of preparing the same according to the present disclosure may prevent loss occurring in a filling process due to superior mechanical durability and wear according to long-term use, may inhibit polymer formation and carbon deposition during reaction, and may provide a superior conversion rate and superior selectivity.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: March 14, 2017
    Assignee: LG CHEM, LTD.
    Inventors: Dae Chul Kim, Dong Hyun Ko, Sung June Cho, Jun Han Kang, Kyong Yong Cha, Joo Hyuck Lee, Hyun Seok Nam, Dae Heung Choi, Myung Ji Suh, Ye Seul Hwang, Jun Kyu Han, Sang Jin Han
  • Publication number: 20170036972
    Abstract: Disclosed are a method of preparing conjugated diene and a device therefor. More particularly, disclosed a method of preparing conjugated diene, wherein generated gas including butadiene is cooled and then water discharged at a lower part is not directly treated as waste water and subjected to byproduct removal and steam-extraction to utilize converted steam, and an installation issue of an existing biological waste water disposal equipment due to an excessive amount of byproducts can be resolved, and a device therefor are disclosed.
    Type: Application
    Filed: October 20, 2015
    Publication date: February 9, 2017
    Inventors: Sang Jin HAN, Jun Han KANG, Dong Hyun KO, Hyun Seok NAM, Joo Hyuck LEE, Jun Kyu HAN, Myung Ji SUH, Kyong Yong CHA, Dae Heung CHOI, Ye Seul HWANG
  • Publication number: 20160368839
    Abstract: Provided are a method of preparing a multicomponent bismuth-molybdenum composite metal oxide catalyst, and a multicomponent bismuth-molybdenum composite metal oxide catalyst prepared thereby. According to the preparation method, since the almost same structure as that of a typical quaternary bismuth-molybdenum catalyst may be obtained by performing two-step co-precipitation, i.e., primary and secondary co-precipitation, of metal components constituting the catalyst, the reduction of catalytic activity due to the deformation of the structure of the catalyst may be suppressed.
    Type: Application
    Filed: June 4, 2015
    Publication date: December 22, 2016
    Inventors: Ye Seul HWANG, Dong Hyun KO, Kyong Yong CHA, Dae Heung CHOI, Myung Ji SUH, Jun Han KANG, Joo Hyuck LEE, Hyun Seok NAM, Jun Kyu HAN, Sang Jin HAN