Patents by Inventor Sang Gi Lee

Sang Gi 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: 20250043401
    Abstract: An aspect of the present invention provides: an austenitic high-manganese steel having excellent extreme low temperature toughness in a heat-affected cone; and a method for manufacturing same.
    Type: Application
    Filed: December 20, 2022
    Publication date: February 6, 2025
    Applicant: POSCO CO., LTD
    Inventors: Soon-Gi LEE, Sang-DEok KANG
  • Publication number: 20250043405
    Abstract: According to one aspect of the present invention, an austenitic high-manganese steel having excellent ultra-low temperature toughness in a weld heat-affected zone, and a manufacturing method therefor can be provided.
    Type: Application
    Filed: December 20, 2022
    Publication date: February 6, 2025
    Applicant: POSCO Co., Ltd
    Inventors: Soon-Gi LEE, Sang-Deok KANG
  • Publication number: 20250034671
    Abstract: According to one aspect of the present invention, an austenitic high-manganese steel having excellent ultra-low temperature toughness in a weld heat-affected cone, and a manufacturing method therefor can be provided.
    Type: Application
    Filed: December 20, 2022
    Publication date: January 30, 2025
    Applicant: POSCO CO., LTD
    Inventors: Soon-Gi LEE, Jong-Kyo CHOI, Sang-Deok KANG
  • Publication number: 20250026012
    Abstract: The present disclosure discloses an apparatus and method for evaluating a speed reducer for a robot. An apparatus for evaluating a speed reducer for a robot of the present disclosure includes a motor state input module configured to receive a driving state of a drive motor connected directly to a speed reducer, a storage device, a memory configured to store an executable program, and a processor operatively coupled to the motor state input module, the storage device, and the memory, in which the processor receives a drive current and a rotational speed from the motor state input module, establishes big data, stores the big data in the storage device, establishes a learning model for evaluating the speed reducer on the basis of the drive current and the rotational speed stored in the storage device, performs machine learning, and then diagnoses abnormality of the speed reducer on the basis of the diagnosis learning model by means of the inputted drive current and the inputted rotational speed.
    Type: Application
    Filed: April 29, 2024
    Publication date: January 23, 2025
    Inventor: Sang Gi LEE
  • Patent number: 12202353
    Abstract: Disclosed are a backlash vibration reduction apparatus and method capable of sufficiently performing gear alignment even when torque is increased while a vehicle is driven within a low torque range, thereby minimizing rough vibration due to backlash. The backlash vibration reduction apparatus includes a correction determination unit configured to determine whether it is necessary to correct a torque gradient to be applied for an increase to target torque in the state in which the current torque of a vehicle is retained within a predetermined low torque range and a torque gradient correction unit configured to determine a corrected torque gradient in which a torque increase rate per hour is reduced and a torque increase time period is extended by multiplying a correction factor by a first torque gradient as a torque gradient that increases the current torque upon determining that it is necessary to correct the torque gradient.
    Type: Grant
    Filed: October 17, 2022
    Date of Patent: January 21, 2025
    Assignees: Hyundai Motor Company, Kia Corporation
    Inventors: Won Bin Lee, Seul Gi Lee, Soo Bang Lee, Sang Kook Woo
  • Patent number: 12083497
    Abstract: The present disclosure relates to a method for preparing a super absorbent polymer that enables the preparation of a more improved super absorbent polymer even without excessive use of a surfactant and use of a foaming agent, and a super absorbent polymer prepared therefrom which exhibits a superior absorption rate.
    Type: Grant
    Filed: May 4, 2020
    Date of Patent: September 10, 2024
    Assignee: LG Chem, Ltd.
    Inventors: Sang Gi Lee, Mookon Kim, Yong Hun Lee, Hyemi Nam, Jiyoon Jeong, Chang Hun Lee
  • Patent number: 11731105
    Abstract: The present invention relates to a super absorbent polymer. The super absorbent polymer contains polymer particles formed of large pores in a certain amount or more, and thus can exhibit large surface area and excellent initial absorption capacity. Therefore, when the super absorbent polymer is used, it can provide a sanitary material such as a diaper or a sanitary napkin which can quickly absorb body fluids and impart a dry and soft touch feeling.
    Type: Grant
    Filed: August 14, 2018
    Date of Patent: August 22, 2023
    Inventors: Ki Hyun Kim, Kyu Pal Kim, Gi Cheul Kim, Seul Ah Lee, Sang Gi Lee
  • Patent number: 11655318
    Abstract: A method of preparing super absorbent polymer includes carrying out a crosslinking polymerization of a monomer mixture comprising a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups, a forming agent, a foam-promoting agent and a silicone-based surfactant in the presence of an internal crosslinking agent to form a hydrogel polymer; drying, pulverizing and classifying the hydrogel polymer to form a base polymer powder; and further crosslinking a surface of the base polymer powder in the presence of a surface crosslinking agent to form a surface crosslinked layer. The method produces super absorbent polymer having not only an excellent absorbent capacity and an absorbency under load but also the rewetting phenomenon can be effectively prevented.
    Type: Grant
    Filed: September 30, 2020
    Date of Patent: May 23, 2023
    Inventors: Sang Gi Lee, Hye Mi Nam, Min Ho Hwang, Soo Jin Lee, Tae Hwan Jang
  • Patent number: 11635421
    Abstract: A SAP evaluation apparatus includes: a main body installed with a lifting bar that is raised or lowered; a container portion installed under the lifting bar in the main body and having an internal containing space for containing an absorber; an operating portion connected to the lifting bar and having a lifting plate that is raised or lowered within the containing space and applies pressure to the absorber and an injection portion for injecting an ink in the direction of the absorber; a dispersion measurement portion for measuring the dispersion of the ink through the absorber; and a controller installed at the main body to measure absorption of the ink into the absorber and measure swelling capacity of the absorber while the ink is injected into the absorber.
    Type: Grant
    Filed: August 24, 2018
    Date of Patent: April 25, 2023
    Inventors: Yeon Soo Kim, Hye Mi Nam, Hyunsup Lee, Sang Gi Lee, Chang Hun Han, Myung Han Lee, Hyejin Han
  • Patent number: 11618805
    Abstract: The present invention relates to a method for preparing a superabsorbent polymer, and a superabsorbent polymer prepared thereby. A superabsorbent polymer prepared by the preparation method exhibits minimized deterioration of physical properties after being pulverized, and thus basic absorbance performance is excellent and an excellent liquid permeability and absorbance rate can be exhibited.
    Type: Grant
    Filed: May 11, 2020
    Date of Patent: April 4, 2023
    Inventors: Hye Mi Nam, Min Ho Hwang, Sang Gi Lee, Tae Hwan Jang, Soo Jin Lee
  • Patent number: 11504696
    Abstract: The present invention relates to a super absorbent polymer. The super absorbent polymer exhibits excellent initial absorption capacity, and thus can provide a sanitary material such as a diaper or a sanitary napkin which can quickly absorb body fluids and impart a dry and soft touch feeling.
    Type: Grant
    Filed: August 14, 2018
    Date of Patent: November 22, 2022
    Inventors: Kyu Pal Kim, Gi Cheul Kim, Ki Hyun Kim, Seul Ah Lee, Sang Gi Lee
  • Patent number: 11466128
    Abstract: A superabsorbent polymer having optimized gel strength and exhibiting an improved absorption rate without increasing a specific surface area by chemical foaming or a physical method, and a preparation method thereof, are provided.
    Type: Grant
    Filed: June 11, 2019
    Date of Patent: October 11, 2022
    Inventors: Yong Hun Lee, Mookon Kim, Dae Woo Nam, Hyemi Nam, Sang Gi Lee, Chang Hun Lee, Jiyoon Jeong, Chang Hun Han
  • Patent number: 11407848
    Abstract: A method is provided for preparing a super absorbent polymer capable of exhibiting an excellent absorption rate by including a uniform porous structure through a simple and economical process. The method includes: performing a crosslinking polymerization of a water-soluble ethylenically unsaturated monomer to form a hydrogel polymer; drying and pulverizing the hydrogel polymer; classifying the pulverized polymer into polymer particles having a particle size of at least 10 to 150 ?m, polymer particles having a particle size of 150 to 200 ?m, and polymer particles having a particle size of 200 to 850 ?m to form a base polymer powder having a particle size of 150 to 850 ?m; and surface-crosslinking the base polymer powder, wherein in the crosslinking polymerization step, the foaming polymerization proceeds in the presence of polymer particles having an average particle size of 10 to 200 ?m obtained in the classifying step and an anionic surfactant.
    Type: Grant
    Filed: October 15, 2018
    Date of Patent: August 9, 2022
    Inventors: Moo Kon Kim, Sang Gi Lee, Hye Mi Nam, Chang Hun Lee, Tae Yun Kim
  • Patent number: 11384208
    Abstract: A super absorbent polymer according to the present invention has an excellent discoloration resistance property even under high temperature/high humidity conditions, while maintaining excellent absorption performance, and is preferably used for hygienic materials such as diapers, and thus can exhibit excellent performance.
    Type: Grant
    Filed: May 10, 2017
    Date of Patent: July 12, 2022
    Inventors: Sang Gi Lee, Hye Mi Nam, Soo Jin Lee, Chang Sun Han, Moo Kon Kim
  • Patent number: 11325101
    Abstract: The present invention relates to a super absorbent polymer having not only excellent absorption rate and absorbency under load but also excellent rewetting properties, and a method for preparing the same.
    Type: Grant
    Filed: November 17, 2016
    Date of Patent: May 10, 2022
    Inventors: Sang Gi Lee, Hye Mi Nam, Min Ho Hwang, Soo Jin Lee, Tae Hwan Jang
  • Publication number: 20220016599
    Abstract: The present disclosure relates to a method for preparing a super absorbent polymer that enables the preparation of a more improved super absorbent polymer even without excessive use of a surfactant and use of a foaming agent, and a super absorbent polymer prepared therefrom which exhibits a superior absorption rate.
    Type: Application
    Filed: May 4, 2020
    Publication date: January 20, 2022
    Applicant: LG Chem, Ltd.
    Inventors: Sang Gi Lee, Mookon Kim, Yong Hun Lee, Hyemi Nam, Jiyoon Jeong, Chang Hun Lee
  • Publication number: 20210268475
    Abstract: The present disclosure relates to: a super absorbent polymer having a rapid absorption rate and maintaining elasticity even in a condition of being pressed multiple times, thereby having excellent dryness characteristic; and a preparation method therefor. The super absorbent polymer of the present disclosure exhibits excellent performance for use in hygiene materials such as diapers.
    Type: Application
    Filed: January 17, 2020
    Publication date: September 2, 2021
    Applicant: LG Chem, Ltd.
    Inventors: Hyemi Nam, Sang Gi Lee, Yeonsoo Kim, Chang Hun Lee
  • Patent number: 11071968
    Abstract: The present invention relates to a method for preparing superabsorbent polymer that has not only excellent permeability and absorption speed, but also minimized absorbency under pressure decrease rate, and superabsorbent polymer prepared thereby.
    Type: Grant
    Filed: March 4, 2020
    Date of Patent: July 27, 2021
    Inventors: Min Ho Hwang, Hye Mi Nam, Sang Gi Lee, Soo Jin Lee, Tae Hwan Jang
  • Patent number: 11059025
    Abstract: The present invention relates to a super absorbent resin, and the super absorbent resin can exhibit a fast absorption rate and high gel strength even in a partially swollen state through the size optimization of partially swollen gel particles. Therefore, the use of the super absorbent resin can effectively prevent a rewetting phenomenon.
    Type: Grant
    Filed: June 1, 2016
    Date of Patent: July 13, 2021
    Inventors: Sang Gi Lee, Hye Mi Nam, Min Ho Hwang, Soo Jin Lee, Tae Hwan Jang
  • Publication number: 20210179790
    Abstract: The present disclosure relates to a super absorbent polymer having a high water content and a method for preparing the same. The super absorbent polymer according to the present disclosure has a relatively high water content compared to a conventional one but has no degradation in absorption-related physical properties, and thereby can be used in various fields.
    Type: Application
    Filed: December 6, 2018
    Publication date: June 17, 2021
    Applicant: LG Chem, Ltd.
    Inventors: Junwye Lee, Chang Hun Lee, Kwangin Shin, Chang Hun Han, Sang Gi Lee