C21B 13/023
Wherein iron or steel is obtained in a molten state
Official title: {wherein iron or steel is obtained in a molten state}
C21B13/023 (Wherein iron or steel is obtained in a molten state) appears on 40 US grants and 34 published applications in this corpus.
Search patents in C21B- Granted patents
- 40
- Published applications
- 34
- Assignees
- 31
- Inventors
- 132
- Latest grant
- 23 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 2 | 2 |
| 2011 | 1 | 3 |
| 2012 | 1 | 2 |
| 2013 | 0 | 1 |
| 2014 | 3 | 3 |
| 2015 | 1 | 3 |
| 2016 | 4 | 1 |
| 2017 | 2 | 0 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 1 | 1 |
| 2021 | 0 | 2 |
| 2022 | 0 | 1 |
| 2023 | 1 | 3 |
| 2024 | 1 | 3 |
| 2025 | 1 | 3 |
| 2026 | 0 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Iron (DRI) between a DRI source and processing equipment for the DRI23 Sep 2025US 12,421,564 B2Midrex Technologies, Inc.
- Method and system for heating direct reduced iron (DRI) between a DRI source and processing equipment for the DRI23 Apr 2024US 11,965,221 B2Midrex Technologies, Inc.
- Integration of DR plant and electric DRI melting furnace for producing high performance iron17 Oct 2023US 11,788,159 B2Midrex Technologies, Inc.
- Classified reduction gasification iron smelting process of iron ore powder and coal powder in a Y-type entrained flow bed13 Oct 2020US 10,801,081 B2China University of Petroleum (East China)
- Systems and methods for generating carbon dioxide for use as a reforming oxidant in making syngas or reformed gas4 Sep 2018US 10,065,857 B2Midrex Technologies, Inc.
- Process of direct reduction of iron ores by means of synthesis gas produced with catalytic partial oxidation6 Aug 2026US 2026/0226570 A1
- A method for manufacturing pig iron in an electrical smelting furnace and associated furnace25 Jun 2026US 2026/0176708 A1
- Sulfur management in a smelting process21 May 2026US 2026/0139336 A1Nucor Corporation
- Method and an arrangement for a continuous production of sponge iron from iron ore20 Nov 2025US 2025/0354226 A1HYBRIT Development AB
- Method and system for removing carbon deposit at electric heating system in a direct reduction plant utilizing hydrogen19 Jun 2025US 2025/0197956 A1Midrex Technologies, Inc.
Most cited
By later US patents
- Plant for producing steel from scrap17US 4,740,989 AVoest-Alpine Aktiengesellschaft · 1988
- Charging material preheater for preheating charging material for a metallurgical smelting unit13US 4,852,858 AKortec, Inc. · 1989
- Process for the direct reduction of metal oxides12US 3,953,196 A1976
- Process for the production of intermediate hot metal12US 4,111,687 AConsolidated Natural Gas Service Company, Inc. · 1978
- Method for reducing particulate iron oxide to molten iron with solid reductant8US 4,179,278 AMidrex Corporation · 1979