Patents by Inventor Oh Duck Kwon
Oh Duck Kwon 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).
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Patent number: 11773472Abstract: The present invention relates to a magnesium alloy sheet and a manufacturing method thereof. In detail, the magnesium alloy sheet includes 0.5 to 3.5 wt % of Al, 0.5 to 1.5 wt % of Zn, 0.1 to 1.0 wt % of Ca, 0.01 to 1.0 wt % of Mn, a remainder of Mg, and other inevitable impurities with respect to an entire 100 wt % of a magnesium alloy sheet, wherein an average crystal grain size of the magnesium alloy sheet is 3 to 15 ?m, the magnesium alloy sheet includes a stringer, and a length of the stringer in a rolling direction (RD) is equal to or less than the maximum value of 50 ?m.Type: GrantFiled: December 21, 2018Date of Patent: October 3, 2023Assignee: POSCO CO., LTDInventors: Jun Ho Park, Hyun Bom Lee, Jae Joong Kim, Oh-Duck Kwon
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Patent number: 11268178Abstract: An exemplary embodiment of the present invention relates to a magnesium alloy sheet and a manufacturing method thereof. The exemplary embodiment of the present invention provides a magnesium alloy sheet including 0.5 to 2.1 wt % of Al, 0.5 to 1.5 wt % of Zn, 0.1 to 1.0 wt % of Ca, and a balance of Mg and inevitable impurities, with respect to a total of 100 wt % of the magnesium alloy sheet.Type: GrantFiled: December 21, 2017Date of Patent: March 8, 2022Assignee: POSCOInventors: Jun Ho Park, Sang Hyun Kim, Jae Joong Kim, Oh-Duck Kwon, Hyun Bom Lee
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Patent number: 11091823Abstract: An exemplary embodiment of the present invention relates to a magnesium alloy sheet and a manufacturing method thereof. According to an exemplary embodiment of the present invention, a magnesium alloy sheet including 1.0 to 10.5 wt % of Al, 0.1 to 2.0 wt % of Zn, 0.1 to 2.0 wt % of Ca, 0.03 to 1.0 wt % of Y, 0.002 to 0.02 wt % of Be, and a balance of Mg and inevitable impurities, with respect to a total of 100 wt % of the magnesium alloy sheet, may be provided.Type: GrantFiled: December 12, 2017Date of Patent: August 17, 2021Assignee: POSCOInventors: Young-Wook Chae, Jun Ho Park, Jae Joong Kim, Oh-Duck Kwon
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Publication number: 20210147964Abstract: A magnesium alloy sheet containing, relative to 100 wt % of the entire magnesium alloy sheet, 2.7 to 5.0 wt % of Al, 0.75 to 1.0 wt % of Zn, 0.1 to 1.0 wt % of Ca, 1.0 wt % or less of Mn (excluding 0 wt %), and the balance of Mg and other inevitable impurities, wherein a volume fraction of bottom crystal grains, relative to 100 vol % of overall crystal grains of the magnesium alloy sheet, is 30% or less, and the bottom crystal grains are crystal grains in a <0001>//C-axis direction.Type: ApplicationFiled: June 21, 2018Publication date: May 20, 2021Inventors: Jun Ho Park, Oh-Duck Kwon, Sang Hyun Kim, Jae Joong Kim
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Publication number: 20210079503Abstract: The present invention relates to a magnesium alloy sheet and a manufacturing method thereof. In detail, the magnesium alloy sheet includes 0.5 to 3.5 wt % of Al, 0.5 to 1.5 wt % of Zn, 0.1 to 1.0 wt % of Ca, 0.01 to 1.0 wt % of Mn, a remainder of Mg, and other inevitable impurities with respect to an entire 100 wt % of a magnesium alloy sheet, wherein an average crystal grain size of the magnesium alloy sheet is 3 to 15 ?m, the magnesium alloy sheet includes a stringer, and a length of the stringer in a rolling direction (RD) is equal to or less than the maximum value of 50 ?m.Type: ApplicationFiled: December 21, 2018Publication date: March 18, 2021Inventors: Jun Ho Park, Hyun Bom Lee, Jae Joong Kim, Oh-Duck Kwon
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Publication number: 20200370157Abstract: The present invention relates to a magnesium alloy sheet and a manufacturing method thereof. An embodiment of the present invention provides a magnesium alloy sheet including 0.5 to 1.5 wt % of Al, 0.5 to 1.5 wt % of Zn, 0.1 to 1.0 wt % of Ca, 0.01 to 1.0 wt % of Mn, a remainder of Mg, and other inevitable impurities with respect to the entire 100 wt % of the magnesium alloy sheet.Type: ApplicationFiled: December 21, 2018Publication date: November 26, 2020Inventors: Jun Ho PARK, Oh-Duck KWON, Young-Wook CHAE, Jae Joong KIM
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Publication number: 20200087767Abstract: An exemplary embodiment of the present invention relates to a magnesium alloy sheet and a manufacturing method thereof. The exemplary embodiment of the present invention provides a magnesium alloy sheet including 0.5 to 2.1 wt % of Al, 0.5 to 1.5 wt % of Zn, 0.1 to 1.0 wt % of Ca, and a balance of Mg and inevitable impurities, with respect to a total of 100 wt % of the magnesium alloy sheet.Type: ApplicationFiled: December 21, 2017Publication date: March 19, 2020Inventors: Jun Ho PARK, Sang Hyun KIM, Jae Joong KIM, Oh-Duck KWON, Hyun Bom LEE
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Publication number: 20200056270Abstract: The present invention relates to a high-formed magnesium alloy sheet and a method of manufacturing the same. One embodiment of the present invention provides a magnesium alloy sheet comprising: 3.0 wt % or less (excluding 0 wt %) of Zn, 1.5 wt % or less (excluding 0 wt %) of Ca, 1.0 wt % or less (excluding 0 wt %) of Mn, balance of Mg and inevitable impurities, for a total of 100 wt %, wherein, the magnesium alloy sheet further comprises 0.3 wt % or less of Al, based on 100 wt % of the entire magnesium alloy sheet, and the magnesium alloy sheet satisfies the following formulas (1) and (2): [Zn]/[Ca]?4.0??formula (1) [Zn]+[Ca]>[Mn]??formula (2) [Zn], [Ca], and [Mn] refer to weight percent of each component.Type: ApplicationFiled: October 20, 2017Publication date: February 20, 2020Inventors: Sang Hyun Kim, Oh-Duck Kwon, Jae Joong Kim
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Publication number: 20190368010Abstract: An exemplary embodiment of the present invention relates to a magnesium alloy sheet and a manufacturing method thereof. According to an exemplary embodiment of the present invention, a magnesium alloy sheet including 1.0 to 10.5 wt % of Al, 0.1 to 2.0 wt % of Zn, 0.1 to 2.0 wt % of Ca, 0.03 to 1.0 wt % of Y, 0.002 to 0.02 wt % of Be, and a balance of Mg and inevitable impurities, with respect to a total of 100 wt % of the magnesium alloy sheet, may be provided.Type: ApplicationFiled: December 12, 2017Publication date: December 5, 2019Applicants: POSCO, POSCOInventors: Young-Wook Chae, Jun Ho Park, Jae Joong Kim, Oh-Duck Kwon
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Publication number: 20190177819Abstract: Provided is a magnesium alloy material and a method for manufacturing the same. The magnesium alloy material includes: 0.8 to 1.8 wt % of Mn, 0.2 wt % or less (excluding 0 wt %) of Ca and the balance of Mg and inevitable impurities, for a total of 100 wt %. The magnesium alloy material has a recrystallized structure of 99 vol % or more for 100 vol % of the total microstructure of the magnesium alloy material.Type: ApplicationFiled: June 15, 2017Publication date: June 13, 2019Inventors: Sang Hyun KIM, Jae Joong KIM, Oh Duck KWON
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Publication number: 20190093200Abstract: A method for manufacturing a magnesium alloy sheet according to an embodiment of the present invention comprises the steps of casting a molten metal containing 2.7 to 5 wt % of Al, 0.75 to 1 wt % of Zn, 0.1 to 0.7 wt % of Ca and 1 wt % or less (Excluding 0 wt %) of Mn and consisting of the balance of Mg and inevitable impurities to produce a casted material (S10), subjecting the casted material to homogenization heat treatment (S20) and warm-rolling the casted material subjected to homogenization treatment (S30).Type: ApplicationFiled: December 23, 2016Publication date: March 28, 2019Applicant: POSCOInventors: Jun Ho PARK, Oh Duck KWON, Hyun Bom LEE, Jae Joong KIM
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Patent number: 8210238Abstract: A continuous casting machine and method using molten mold flux, wherein the continuous casting machine includes a mold cover for covering an upper portion of a mold; a mold flux melting unit for melting mold flux to be supplied into the mold; and a mold flux delivery unit for supplying the mold with the molten mold flux melted in the mold flux melting unit, wherein the delivery unit includes an injection tube with one end connected to the mold flux melting unit and the other end positioned in the mold through the mold cover, and an injection tube heater for heating the injection tube. Since a slag bear continuous casting machine and method using molten mold flux is removed, the consumption of mold flux is greatly increased compared with the case of a conventional casting work, so that the friction between a mold and a solidified shell is reduced. As a result, an amount of scarfing of a cast piece is greatly reduced and no carbon pick-up occurs.Type: GrantFiled: June 22, 2007Date of Patent: July 3, 2012Assignee: PoscoInventors: Jung Wook Cho, Hyun Seok Jeong, Jong Min Park, Goo Hwa Kim, Oh Duck Kwon, Joong Kil Park, Soon Kyu Lee, Sang Ho Lee, Ki Hyeon Moon
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Publication number: 20090321035Abstract: Disclosed is a casting roll for a twin roll strip caster, and particularly, a casting roll for a twin roll strip caster, in which a continuous gas channel, for preventing the generation of dents in the surface of a strip when casting TWIP steel in order to improve the mechanical properties of the strip, including increasing the tensile strength and elongation, is formed in the surface of the casting roll, thus discharging gas mixed when the strip is cast, thereby preventing the generation of dents in the surface of the strip when casting the TWIP steel, in particular, a continuous gas channel is formed, thereby decreasing a conventional dent index and discouraging the generation of dents.Type: ApplicationFiled: July 26, 2007Publication date: December 31, 2009Applicant: POSCO CO., LTD.Inventors: Man-Jin Ha, Seong-In Jeong, Ju-Tae Choi, Wan-Soo Kim, Tae-Wook Kang, Oh-Duck Kwon
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Publication number: 20090165987Abstract: The present invention relates to a continuous casting machine and method using molten mold flux. The continuous casting machine includes a mold cover for covering an upper portion of a mold; a mold flux melting unit for melting mold flux to be supplied into the mold; and a mold flux delivery unit for supplying the mold with the molten mold flux melted in the mold flux melting unit, wherein the delivery unit includes an injection tube with one end connected to the mold flux melting unit and the other end positioned in the mold through the mold cover, and an injection tube heater for heating the injection tube. According to the present invention, since a slag bear continuous casting machine and method using molten mold flux is removed, a consumption of mold flux is greatly increased compared with a case of a conventional casting work, so that the friction between a mold and a solidified shell is reduced. As a result, an amount of scarfing of a cast piece is greatly reduced and no carbon pick-up occurs.Type: ApplicationFiled: June 22, 2007Publication date: July 2, 2009Inventors: Jung Wook Cho, Hyun Seok Jeong, Jong Min Park, Goo Hwa Kim, Oh Duck Kwon, Joong Ki Park, Soo Kyu Lee, Sang Ho Lee, Ki Hyeon Moon
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Patent number: 5708746Abstract: A structurally improved rail-type device for mechanically splicing optical fibers while reducing the splicing loss is disclosed. The above splicing device not only has a cladding clamp with a seesaw structure thereby easily splicing the optical fibers, it also separately moves the covers relative to the body to easily perform the tuning operation. Due to coating clamp's protrusions and body's slots engaging with each other, the coating clamp exclusively vertically move relative to the body and prevent the optical fibers from being axially thrust. The splicing device further seperately clamps the coating and cladding parts of the optical fibers, thereby preventing the spliced fibers from breaking due to tensile or torsional force. The sliding motion of the covers relative to the body is achieved by the rails of the covers and rail grooves of the body.Type: GrantFiled: December 12, 1995Date of Patent: January 13, 1998Assignee: Korea Telecommunication AuthorityInventors: Han Ha Kim, Young Tak Lee, Jae Kuk Nam, Byung Chul Lee, Jong Young Ha, Young Bok Choi, Mee Kyung Kim, Jong Sup Kim, Oh Duck Kwon, Kun Ik Jun, Young Kyu Lee