C21B 13/002
Reduction of iron ores by passing through a heated column of carbon
Official title: {Reduction of iron ores by passing through a heated column of carbon}
C21B13/002 (Reduction of iron ores by passing through a heated column of carbon) appears on 190 US grants and 61 published applications in this corpus.
Search patents in C21B- Granted patents
- 190
- Published applications
- 61
- Assignees
- 67
- Inventors
- 236
- Latest grant
- 16 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 0 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 5 | 0 |
| 1987 | 4 | 0 |
| 1988 | 8 | 0 |
| 1989 | 11 | 0 |
| 1990 | 7 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 4 | 0 |
| 1995 | 12 | 0 |
| 1996 | 7 | 0 |
| 1997 | 4 | 0 |
| 1998 | 5 | 0 |
| 1999 | 10 | 0 |
| 2000 | 7 | 0 |
| 2001 | 23 | 1 |
| 2002 | 7 | 2 |
| 2003 | 3 | 3 |
| 2004 | 2 | 3 |
| 2005 | 1 | 2 |
| 2006 | 1 | 5 |
| 2007 | 0 | 1 |
| 2008 | 2 | 5 |
| 2009 | 4 | 3 |
| 2010 | 5 | 6 |
| 2011 | 4 | 8 |
| 2012 | 2 | 2 |
| 2013 | 6 | 3 |
| 2014 | 2 | 7 |
| 2015 | 3 | 1 |
| 2016 | 6 | 1 |
| 2017 | 1 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 1 |
| 2023 | 1 | 1 |
| 2024 | 0 | 1 |
| 2025 | 2 | 2 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hot metal production from DRI with electric arc heating16 Dec 2025US 12,497,668 B2Kobe Steel, Ltd.
- Process for the smelting of a metalliferous feedstock material4 Mar 2025US 12,241,133 B2African Rainbow Minerals Limited
- Integration of DR plant and electric DRI melting furnace for producing high performance iron17 Oct 2023US 11,788,159 B2Midrex Technologies, Inc.
- System for energy optimization in a plant for producing direct-reduced metal ores3 Jan 2017US 9,534,264 B2Primetals Technologies Austria GmbH
- Method and device for charging coal-containing material and iron carrier material18 Oct 2016US 9,470,456 B2Primetals Technologies Austria GmbH
- Hot Metal Production from DRI with Electric Arc Heating12 Mar 2026US 2026/0071288 A1Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
- Method of reducing iron ore powder22 May 2025US 2025/0163525 A1Jfe Steel Corporation
- Facility for producing reduced iron and method for producing reduced iron23 Jan 2025US 2025/0027178 A1Nippon Steel Corporation
- Reduced iron production method and reduced iron production device30 May 2024US 2024/0175101 A1Jfe Steel Corporation
- Hot Metal Production from DRI with Electric Arc Heating14 Sep 2023US 2023/0287528 A1Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
Most cited
By later US patents
- Method and system for energy-optimized and CO2 emission-optimized iron production101US 8,419,825 B2Siemens Vai Metals Technologies GmbH · 2013
- Method for producing molten iron by submerged combustion69US 4,238,226 AMidrex Corporation · 1980
- Apparatus for producing molten iron by submerged combustion67US 4,270,740 AMidrex Corporation · 1981
- Methods for melting and refining a powdery ore containing metal oxides39US 4,874,427 AKawasaki Steel Corporation · 1989
- Apparatus for coal-gasification and making pig iron33US 4,504,043 ASumitomo Metal Industries, Ltd. · 1985