| Utility: Non-oriented electrical steel sheet and manufacturing method therefor Filling date: 6 Sep 2025 Issue date: 13 Jul 2021 | 19 Dec 2017 | 13 Jul 2021 |
| Utility: Non-oriented electrical steel sheet and manufacturing method therefor Filling date: 6 Sep 2025 Issue date: 13 Jul 2021 | 19 Dec 2017 | 13 Jul 2021 |
| Utility: Hot dip coated steel having excellent processability Filling date: 6 Sep 2025 Issue date: 13 Jul 2021 | 19 Dec 2017 | 13 Jul 2021 |
| Utility: Method for refining magnetic domains of grain-oriented electrical steel plates, and apparatus therefor Filling date: 6 Sep 2025 Issue date: 13 Jul 2021 | 23 Dec 2016 | 13 Jul 2021 |
| Utility: Directional electric steel plate having excellent magnetic properties and manufacturing method thereof Filling date: 6 Sep 2025 Issue date: 13 Jul 2021 | 21 Dec 2015 | 13 Jul 2021 |
| Utility: Stainless steel for polymer fuel cell separator and method for preparing same Filling date: 6 Sep 2025 Issue date: 29 Jun 2021 | 8 Feb 2016 | 29 Jun 2021 |
| Utility: High manganese hot dip aluminum-plated steel sheet having excellent sacrificial corrosion resistance and platability and manufacturing method therefor Filling date: 6 Sep 2025 Issue date: 15 Jun 2021 | 21 Dec 2017 | 15 Jun 2021 |
| Utility: Composition for washing pickled steel plate, method for washing pickled steel plate by using same, and steel plate obtained thereby Filling date: 6 Sep 2025 Issue date: 8 Jun 2021 | 19 Dec 2016 | 8 Jun 2021 |
| Utility: Grain-oriented electrical steel sheet and manufacturing method therefor Filling date: 6 Sep 2025 Issue date: 8 Jun 2021 | 8 Dec 2014 | 8 Jun 2021 |
| Utility: Triple-phase stainless steel and method for producing same Filling date: 6 Sep 2025 Issue date: 1 Jun 2021 | 30 Aug 2016 | 1 Jun 2021 |
| Utility: Preparation method of lithium-titanium complex oxide according to particle size control of slurry through wet-milling Filling date: 6 Sep 2025 Issue date: 18 May 2021 | 26 May 2017 | 18 May 2021 |
| Utility: High-strength hot-dip galvanized steel sheet having excellent plating surface quality and adhesion, and method of manufacturing the same Filling date: 6 Sep 2025 Issue date: 11 May 2021 | 22 Dec 2017 | 11 May 2021 |
| Utility: Method and device for magnetic domain refinement of oriented electrical steel plate Filling date: 6 Sep 2025 Issue date: 11 May 2021 | 23 Dec 2016 | 11 May 2021 |
| Utility: Straightening system and straightening method Filling date: 6 Sep 2025 Issue date: 4 May 2021 | 27 Jul 2016 | 4 May 2021 |
| Utility: Plated steel sheet having multilayer structure and manufacturing method therefor Filling date: 6 Sep 2025 Issue date: 27 Apr 2021 | 21 Dec 2017 | 27 Apr 2021 |
| Utility: Stainless steel for polymer fuel cell separation plate having improved hydrophilicity and contact resistance and method for manufacturing same Filling date: 6 Sep 2025 Issue date: 27 Apr 2021 | 21 Dec 2016 | 27 Apr 2021 |
| Utility: Wire rod having excellent cold forgeability and manufacturing method therefor Filling date: 6 Sep 2025 Issue date: 27 Apr 2021 | 11 Nov 2016 | 27 Apr 2021 |
| Utility: Hot-dip galvanized steel plate with excellent bake hardenability and anti-aging property at room temperature Filling date: 6 Sep 2025 Issue date: 20 Apr 2021 | 8 Nov 2017 | 20 Apr 2021 |
| Utility: Hot-rolled galvanized steel sheet having excellent galling resistance, formability and sealer-adhesion property and method for manufacturing same Filling date: 6 Sep 2025 Issue date: 20 Apr 2021 | 22 Aug 2017 | 20 Apr 2021 |
| Utility: Ultra-high strength steel sheet having excellent phosphatability and bendability Filling date: 6 Sep 2025 Issue date: 13 Apr 2021 | 7 Dec 2016 | 13 Apr 2021 |
| Utility: High-manganese hot-dip aluminum-coated steel sheet having excellent coating adhesion Filling date: 6 Sep 2025 Issue date: 6 Apr 2021 | 23 Dec 2016 | 6 Apr 2021 |
| Utility: Cooling device and cooling method Filling date: 6 Sep 2025 Issue date: 6 Apr 2021 | 27 Jul 2016 | 6 Apr 2021 |
| Utility: Non-magnetic steel material having excellent hot workability and manufacturing method therefor Filling date: 6 Sep 2025 Issue date: 30 Mar 2021 | 23 Dec 2016 | 30 Mar 2021 |
| Utility: Cold-rolled steel sheet with excellent formability, galvanized steel sheet, and manufacturing method thereof Filling date: 6 Sep 2025 Issue date: 9 Mar 2021 | 24 Jul 2019 | 9 Mar 2021 |
| Utility: High tensile strength steel having excellent bendability and stretch-flangeability and manufacturing method thereof Filling date: 6 Sep 2025 Issue date: 9 Mar 2021 | 7 Dec 2017 | 9 Mar 2021 |
| Utility: Non-oriented electrical steel sheet and method for manufacturing the same Filling date: 6 Sep 2025 Issue date: 9 Mar 2021 | 21 Dec 2015 | 9 Mar 2021 |
| Utility: Plated steel sheet for hot press forming having excellent impact property, hot press formed part, and manufacturing method thereof Filling date: 6 Sep 2025 Issue date: 2 Mar 2021 | 15 Dec 2017 | 2 Mar 2021 |
| Utility: Adhesive laminate core manufacturing apparatus and core laminator therefor Filling date: 6 Sep 2025 Issue date: 16 Feb 2021 | 16 Jun 2016 | 16 Feb 2021 |
| Utility: Vertical semi-continuous casting equipment and vertical semi-continuous casting method Filling date: 6 Sep 2025 Issue date: 9 Feb 2021 | 23 Oct 2015 | 9 Feb 2021 |
| Utility: Ultra high-strength and high-ductility steel sheet having excellent yield ratio and manufacturing method therefor Filling date: 6 Sep 2025 Issue date: 2 Feb 2021 | 20 Apr 2017 | 2 Feb 2021 |
| Utility: Grain-oriented electrical steel sheet and manufacturing method therefor Filling date: 6 Sep 2025 Issue date: 2 Feb 2021 | 22 Dec 2016 | 2 Feb 2021 |
| Utility: Plated steel material having excellent friction resistance and white rust resistance and method for preparing same Filling date: 6 Sep 2025 Issue date: 2 Feb 2021 | 16 Dec 2016 | 2 Feb 2021 |
| Utility: Hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet with excellent aging resistance properties and bake hardenability, and method for manufacturing same Filling date: 6 Sep 2025 Issue date: 2 Feb 2021 | 16 Jun 2016 | 2 Feb 2021 |
| Utility: High-strength hot-dip galvanized steel sheet having excellent surface quality and spot weldability Filling date: 6 Sep 2025 Issue date: 26 Jan 2021 | 13 Dec 2016 | 26 Jan 2021 |
| Utility: Complex-phase steel sheet having excellent formability and method of manufacturing the same Filling date: 6 Sep 2025 Issue date: 12 Jan 2021 | 7 Mar 2017 | 12 Jan 2021 |
| Utility: Non-heat treated wire rod having excellent cold workability and manufactured method therefor Filling date: 6 Sep 2025 Issue date: 12 Jan 2021 | 11 Nov 2016 | 12 Jan 2021 |
| Utility: High-strength steel having superior brittle crack arrestability, and production method therefor Filling date: 6 Sep 2025 Issue date: 5 Jan 2021 | 21 Dec 2015 | 5 Jan 2021 |
| Utility: High strength welding joint having excellent impact toughness at very low temperature, and flux-cored arc welding wire therefor Filling date: 6 Sep 2025 Issue date: 15 Dec 2020 | 13 Nov 2018 | 15 Dec 2020 |
| Utility: Grain-oriented electrical steel sheet and manufacturing method therefor Filling date: 6 Sep 2025 Issue date: 1 Dec 2020 | 18 Dec 2015 | 1 Dec 2020 |
| Utility: Aluminum-based alloy plated steel sheet having excellent processing part corrosion resistance Filling date: 6 Sep 2025 Issue date: 17 Nov 2020 | 22 Dec 2017 | 17 Nov 2020 |
| Utility: Pressure vessel steel plate having excellent post weld heat treatment resistance, and manufacturing method therefor Filling date: 6 Sep 2025 Issue date: 10 Nov 2020 | 3 Nov 2016 | 10 Nov 2020 |
| Utility: Lightweight composite metal sheet having excellent vibration damping characteristics, and manufacturing method therefor Filling date: 6 Sep 2025 Issue date: 10 Nov 2020 | 2 Sep 2016 | 10 Nov 2020 |
| Utility: Method for separating propylene carbonate in preparing process of polyether carbonate polyol Filling date: 6 Sep 2025 Issue date: 3 Nov 2020 | 15 Dec 2017 | 3 Nov 2020 |
| Utility: Surface-treatment solution composition containing trivalent chromium and inorganic compound, zinc-based plated steel sheet surface-treated using same, and method for producing same Filling date: 6 Sep 2025 Issue date: 3 Nov 2020 | 29 Sep 2017 | 3 Nov 2020 |
| Utility: High-strength steel having superior brittle crack arrestability, and production method therefor Filling date: 6 Sep 2025 Issue date: 3 Nov 2020 | 21 Dec 2015 | 3 Nov 2020 |
| Utility: Grain-oriented electrical steel plate and manufacturing method thereof Filling date: 6 Sep 2025 Issue date: 27 Oct 2020 | 21 Dec 2015 | 27 Oct 2020 |
| Utility: Method of manufacturing hot press formed parts having excellent powdering resistance Filling date: 6 Sep 2025 Issue date: 20 Oct 2020 | 3 Apr 2018 | 20 Oct 2020 |
| Utility: Electrical steel sheet and method for manufacturing the same Filling date: 6 Sep 2025 Issue date: 13 Oct 2020 | 5 Oct 2018 | 13 Oct 2020 |
| Utility: Thick steel plate having excellent low-temperature toughness and hydrogen-induced cracking resistance, and method for manufacturing same Filling date: 6 Sep 2025 Issue date: 13 Oct 2020 | 16 Dec 2016 | 13 Oct 2020 |
| Utility: High strength galvanized steel sheet having excellent surface qualities, plating adhesion, and formability, and method for manufacturing same Filling date: 6 Sep 2025 Issue date: 6 Oct 2020 | 23 Dec 2015 | 6 Oct 2020 |
