C21B 2100/20
Increasing the gas reduction potential of recycled exhaust gases
C21B2100/20 (Increasing the gas reduction potential of recycled exhaust gases) appears on 331 US grants and 269 published applications in this corpus.
Search patents in C21B- Granted patents
- 331
- Published applications
- 269
- Assignees
- 164
- Inventors
- 652
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 17 | 0 |
| 1978 | 8 | 0 |
| 1979 | 7 | 0 |
| 1980 | 8 | 0 |
| 1981 | 9 | 0 |
| 1982 | 11 | 0 |
| 1983 | 5 | 0 |
| 1984 | 8 | 0 |
| 1985 | 8 | 0 |
| 1986 | 7 | 0 |
| 1987 | 3 | 0 |
| 1988 | 8 | 0 |
| 1989 | 5 | 0 |
| 1990 | 5 | 0 |
| 1991 | 1 | 0 |
| 1992 | 4 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 8 | 0 |
| 1996 | 7 | 0 |
| 1997 | 5 | 0 |
| 1998 | 2 | 0 |
| 1999 | 11 | 0 |
| 2000 | 8 | 0 |
| 2001 | 13 | 1 |
| 2002 | 6 | 3 |
| 2003 | 5 | 4 |
| 2004 | 0 | 2 |
| 2005 | 1 | 3 |
| 2006 | 1 | 3 |
| 2007 | 3 | 1 |
| 2008 | 0 | 2 |
| 2009 | 1 | 4 |
| 2010 | 2 | 10 |
| 2011 | 5 | 12 |
| 2012 | 5 | 18 |
| 2013 | 9 | 9 |
| 2014 | 12 | 19 |
| 2015 | 15 | 12 |
| 2016 | 10 | 14 |
| 2017 | 10 | 6 |
| 2018 | 11 | 5 |
| 2019 | 9 | 4 |
| 2020 | 5 | 4 |
| 2021 | 6 | 9 |
| 2022 | 2 | 17 |
| 2023 | 4 | 23 |
| 2024 | 8 | 36 |
| 2025 | 14 | 27 |
| 2026 | 10 | 21 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for manufacturing direct reduced iron and DRI manufacturing equipment6 Oct 2026US 12,753,452 B2ArcelorMittal
- Process for the production of carburized sponge iron28 Jul 2026US 12,692,563 B2HYBRIT Development AB
- Steel making plant with electric arc furnace21 Apr 2026US 12,607,409 B2SMS group GmbH
- 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
- Method of producing reduced iron8 Oct 2026US 2026/0308705 A1Jfe Steel Corporation
- Ironmaking method and associated plant17 Sep 2026US 2026/0275433 A1
- Plant and mehtod for the production of direct reduced iron10 Sep 2026US 2026/0265847 A1Danieli & C. Officine Meccaniche SpA
- Direct reduction system and method utilizing pre-reducing furnace and heat exchanger10 Sep 2026US 2026/0265849 A1Midrex Technologies, Inc.
- Systematic carbon emissions reduction method for whole process of production and casting3 Sep 2026US 2026/0258513 A1Jiqing Low Carbon Technology (Qinhuangdao) Co., 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
- Process for production of elemental iron82US 7,931,731 B2Shell Oil Company · 2011
- Production of carbon monoxide by the gasification of carbonaceous materials78US 4,265,868 AKoppers Company, Inc. · 1981
- Slagging coal combustor for cementitious slag production, metal oxide reduction, shale gas and oil recovery, enviromental remediation, emission control and CO2 sequestration77US 8,337,613 B22012
- Blast furnace iron production with integrated power generation70US 8,133,298 B2Air Products and Chemicals, Inc. · 2012