C21B 2100/26
By adding additional fuel in recirculation pipes
Official title: by adding additional fuel in recirculation pipes
C21B2100/26 (By adding additional fuel in recirculation pipes) appears on 78 US grants and 110 published applications in this corpus.
Search patents in C21B- Granted patents
- 78
- Published applications
- 110
- Assignees
- 61
- Inventors
- 256
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 5 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 4 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 1 |
| 2003 | 2 | 1 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 1 | 2 |
| 2011 | 1 | 3 |
| 2012 | 1 | 1 |
| 2013 | 2 | 2 |
| 2014 | 2 | 3 |
| 2015 | 3 | 1 |
| 2016 | 2 | 3 |
| 2017 | 1 | 3 |
| 2018 | 4 | 0 |
| 2019 | 1 | 1 |
| 2020 | 0 | 1 |
| 2021 | 1 | 2 |
| 2022 | 1 | 11 |
| 2023 | 1 | 17 |
| 2024 | 6 | 21 |
| 2025 | 9 | 21 |
| 2026 | 5 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for manufacturing direct reduced iron and DRI manufacturing equipment6 Oct 2026US 12,753,452 B2ArcelorMittal
- Coupling system of copper slag recycling and CO2 mineralization based on industrial solid waste14 Apr 2026US 12,601,021 B2Greenore Holding Co.
- Method for producing reduced iron7 Apr 2026US 12,595,522 B2Nippon Steel Corporation
- Hydrogen release/storage system, hydrogen release/storage method, ammonia production equipment, gas turbine, fuel cell, and steel mill24 Mar 2026US 12,582,953 B2Mitsubishi Heavy Industries, Ltd.
- Steelmaking line and method of producing reduced iron27 Jan 2026US 12,534,770 B2Jfe Steel Corporation
- Process of direct reduction of iron ores by means of synthesis gas produced with catalytic partial oxidation6 Aug 2026US 2026/0226570 A1
- Method of producing reduced iron16 Jul 2026US 2026/0201485 A1Jfe Steel Corporation
- Method of producing reduced iron16 Jul 2026US 2026/0201486 A1Jfe Steel Corporation
- Carbon dioxide capture, carbon resource utilization, and hydrogen production system for steel mill2 Jul 2026US 2026/0183700 A1Lowcarbon Co., Ltd.
- Controlling temperature and nox content for a reduction gas11 Jun 2026US 2026/0159909 A1Primetals Technologies Austria GmbH
Most cited
By later US patents
- System and method for reducing iron oxide to metallic iron using coke oven gas and oxygen steelmaking furnace gas49US 8,685,136 B2Midrex Technologies, Inc. · 2014
- Method of smelting reduction of ores containing metal oxides27US 4,940,488 AKawasaki Jukogyo Kabushiki Kaisha · 1990
- Production of reducing gas for furnace injection22US 4,363,654 A1982
- Method and apparatus for producing direct reduced iron with improved reducing gas utilization21US 6,027,545 AHylsa S.A. de C.V. · 2000
- Apparatus for the direct reduction of iron ore14US 4,212,452 A1980