Patents by Inventor Kyung-Jun Ko

Kyung-Jun Ko 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: 11603572
    Abstract: A method for manufacturing a grain-oriented electrical steel sheet according to an embodiment of the present invention comprises: a step for hot-rolling a slab to produce a hot-rolled sheet; a step for cold-rolling the hot-rolled sheet to produce a cold-rolled sheet; a step for subjecting the cold-rolled sheet to primary recrystallization annealing; and a step for subjecting the primary recrystallization annealing-completed cold-rolled sheet to secondary recrystallization annealing, wherein the primary recrystallization annealing step includes a preceding step and a subsequent step, and the amount (A) of nitriding gas introduced in the preceding step with respect to the total amount (B) of nitriding gas introduced in the primary recrystallization annealing step satisfies expression 1 below. 0.05?[A]/[B]?[t]??[Expression 1] (In expression 1, the amount of nitriding gas introduced is in units of Nm3/hr, and [t] represents the thickness (mm) of a cold-rolled sheet.
    Type: Grant
    Filed: September 25, 2019
    Date of Patent: March 14, 2023
    Assignee: POSCO CO., LTD
    Inventors: Kyung-Jun Ko, Hyung Don Joo, Sang-Woo Lee
  • Publication number: 20220042123
    Abstract: A method for manufacturing a grain-oriented electrical steel sheet according to an embodiment of the present invention comprises: a step for hot-rolling a slab to produce a hot-rolled sheet; a step for cold-rolling the hot-rolled sheet to produce a cold-rolled sheet; a step for subjecting the cold-rolled sheet to primary recrystallization annealing; and a step for subjecting the primary recrystallization annealing-completed cold-rolled sheet to secondary recrystallization annealing, wherein the primary recrystallization annealing step includes a preceding step and a subsequent step, and the amount (A) of nitriding gas introduced in the preceding step with respect to the total amount (B) of nitriding gas introduced in the primary recrystallization annealing step satisfies expression 1 below. 0.05?[A]/[B]?[t]??[Expression 1] (In expression 1, the amount of nitriding gas introduced is in units of Nm3/hr, and [t] represents the thickness (mm) of a cold-rolled sheet.
    Type: Application
    Filed: September 25, 2019
    Publication date: February 10, 2022
    Inventors: Kyung-Jun KO, Hyung Don JOO, Sang-Woo LEE
  • Publication number: 20220010402
    Abstract: A grain-oriented electrical steel sheet according to an embodiment of the present invention includes: in wt %, Si at 1.0 to 7.0%, Mn at 0.5% or less (excluding 0%), Al at 0.005% or less (excluding 0%), S at 0.0055% or less (excluding 0%), one or more of Ba and Y at 0.005 to 0.5%, one or more of Sn at 0.02 to 0.15%, Sb at 0.01 to 0.08%, and Ni at 0.02 to 0.5%, and the balance of Fe and inevitable impurities.
    Type: Application
    Filed: November 28, 2019
    Publication date: January 13, 2022
    Inventors: Hyung Don JOO, Kyung-Jun KO, Chang Soo PARK, Jae Kyoum KIM, Sang-Woo LEE, Jin-Wook SEO
  • Publication number: 20200032363
    Abstract: A method for producing a grain-oriented electrical steel sheet according to an embodiment of the present invention comprises the steps of: heating a slab satisfying the following formula 1 and including, by wt %, 3.2 to 4.0% of Si, 0.03 to 0.09% of C, 0.015 to 0.040% of A1, 0.04 to 0.15% of Mn, 0.001 to 0.005% of N, 0.01% or less of S (exclusive of 0%), and the balance of Fe and other inevitable impurities; hot rolling the slab to produce a hot rolled sheet; hot band annealing the hot rolled sheet to at a cracking temperature of 900 to 980? for 30 to 300 seconds; cold rolling the hot rolled sheet, which has completely been hot band annealed, to produce a cold rolled sheet; subjecting the cold rolled sheet to primary recrystallization annealing; and conducting secondary recrystallization annealing for the cold rolled sheet which has completely been primary recrystallization annealed. [Mn]×[S]?0.0004??[Formula 1] (wherein [Mn] and [S] are contents (wt %) of Mn and S in the slab, respectively.
    Type: Application
    Filed: December 21, 2017
    Publication date: January 30, 2020
    Inventors: Kyung Jun KO, Hyung Don JOO, Sang Woo LEE, IL Nam YANG
  • Patent number: 8883699
    Abstract: Disclosed herein is a resist stripping composition, which has an excellent ability of stripping a residual resist remaining after dry or wet etching at the tune of forming patterns in a process of manufacturing a flat panel display substrate.
    Type: Grant
    Filed: October 24, 2012
    Date of Patent: November 11, 2014
    Assignee: Dongwoo Fine-Chem Co., Ltd.
    Inventors: Jeong-Hyun Kim, Kyung-Jun Ko, Sung-Sik Kim, Yu-Jin Lee