C21B 13/029
Introducing coolant gas in the shaft furnaces
Official title: {Introducing coolant gas in the shaft furnaces}
C21B13/029 (Introducing coolant gas in the shaft furnaces) appears on 82 US grants and 30 published applications in this corpus.
Search patents in C21B- Granted patents
- 82
- Published applications
- 30
- Assignees
- 34
- Inventors
- 126
- Latest grant
- 29 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 9 | 0 |
| 1978 | 3 | 0 |
| 1979 | 5 | 0 |
| 1980 | 8 | 0 |
| 1981 | 6 | 0 |
| 1982 | 6 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 0 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 2 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 2 |
| 2013 | 1 | 1 |
| 2014 | 0 | 0 |
| 2015 | 2 | 1 |
| 2016 | 1 | 1 |
| 2017 | 1 | 0 |
| 2018 | 1 | 2 |
| 2019 | 0 | 1 |
| 2020 | 1 | 0 |
| 2021 | 2 | 1 |
| 2022 | 0 | 1 |
| 2023 | 0 | 2 |
| 2024 | 1 | 5 |
| 2025 | 1 | 3 |
| 2026 | 0 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for the direct reduction of iron ore29 Apr 2025US 12,286,679 B2ThyssenKrupp Steel Europe AG
- Method for carburization of HDRI produced in H2 based direct reduction process31 Dec 2024US 12,180,554 B2Primetals Technologies Austria GmbH
- Direct reduction with coal gasification and coke oven gas1 Jun 2021US 11,021,766 B2Midrex Technologies, Inc.
- Direct reduction system and process utilizing a process gas direct recycle line2 Feb 2021US 10,907,224 B2Midrex Technologies, Inc.
- Direct reduction process and shaft furnace utilizing an extended flow diverter cone31 Mar 2020US 10,604,815 B2Midrex Technologies, Inc.
- Systems and methods for direct reduction of iron ore24 Sep 2026US 2026/0287255 A1Uchicago Argonne, LLC
- Cooling gas recirculation in the upper reduction zone of a direct reduction shaft furnace10 Sep 2026US 2026/0265848 A1Midrex Technologies, Inc.
- H2 rich gas injection to direct reduction shaft furnace upper section27 Aug 2026US 2026/0250793 A1Midrex Technologies, Inc.
- Process of direct reduction of iron ores by means of synthesis gas produced with catalytic partial oxidation6 Aug 2026US 2026/0226570 A1
- Method for manufacturing direct reduced iron with a low carbon content2 Jul 2026US 2026/0185172 A1
Most cited
By later US patents
- Method for the direct reduction of iron ore61US 4,160,663 A1979
- Method for the gaseous reduction of metal ores using reducing gas produced by gasification of solid or liquid fossil fuels50US 4,246,024 AGrupo Industrial Alfa, S.A. · 1981
- Method for the direct reduction of iron using gas from coal41US 4,173,465 AMidrex Corporation · 1979
- Method for smelting reduction of iron ore and apparatus therefor30US 5,065,985 ANKK Corporation · 1991
- Method for producing metallic iron particles27US 4,046,557 AMidrex Corporation · 1977