C21B 2100/40
Gas purification of exhaust gases to be recirculated or used in other
Official title: Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
C21B2100/40 (Gas purification of exhaust gases to be recirculated or used in other) appears on 361 US grants and 227 published applications in this corpus.
Search patents in C21B- Granted patents
- 361
- Published applications
- 227
- Assignees
- 180
- Inventors
- 714
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 14 | 0 |
| 1978 | 7 | 0 |
| 1979 | 8 | 0 |
| 1980 | 14 | 0 |
| 1981 | 13 | 0 |
| 1982 | 11 | 0 |
| 1983 | 6 | 0 |
| 1984 | 2 | 0 |
| 1985 | 7 | 0 |
| 1986 | 5 | 0 |
| 1987 | 3 | 0 |
| 1988 | 11 | 0 |
| 1989 | 12 | 0 |
| 1990 | 14 | 0 |
| 1991 | 6 | 0 |
| 1992 | 2 | 0 |
| 1993 | 5 | 0 |
| 1994 | 5 | 0 |
| 1995 | 15 | 0 |
| 1996 | 7 | 0 |
| 1997 | 6 | 0 |
| 1998 | 4 | 0 |
| 1999 | 9 | 0 |
| 2000 | 13 | 0 |
| 2001 | 25 | 2 |
| 2002 | 9 | 5 |
| 2003 | 5 | 3 |
| 2004 | 3 | 5 |
| 2005 | 2 | 6 |
| 2006 | 1 | 7 |
| 2007 | 2 | 5 |
| 2008 | 2 | 6 |
| 2009 | 5 | 15 |
| 2010 | 5 | 10 |
| 2011 | 7 | 12 |
| 2012 | 11 | 13 |
| 2013 | 12 | 5 |
| 2014 | 5 | 12 |
| 2015 | 11 | 6 |
| 2016 | 5 | 7 |
| 2017 | 8 | 5 |
| 2018 | 4 | 8 |
| 2019 | 4 | 1 |
| 2020 | 7 | 5 |
| 2021 | 4 | 5 |
| 2022 | 3 | 7 |
| 2023 | 3 | 13 |
| 2024 | 3 | 28 |
| 2025 | 6 | 17 |
| 2026 | 6 | 19 |
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
- Method of removing volatile constituents from an industrial dust, and valuable material-containing product12 May 2026US 12,624,417 B2MontanuniversitäT Leoben
- Steel making plant with electric arc furnace21 Apr 2026US 12,607,409 B2SMS group GmbH
- Method for producing reduced iron7 Apr 2026US 12,595,522 B2Nippon Steel Corporation
- Gas production apparatus, gas production system, steel production system, chemical manufacturing system, and gas production method with reduced carbon dioxide emission24 Mar 2026US 12,582,941 B2Sekisui Chemical Co., Ltd.
- Method of producing reduced iron8 Oct 2026US 2026/0308705 A1Jfe Steel Corporation
- Cold water, wide range wet venturi scrubber for a direct reduction plant1 Oct 2026US 2026/0297696 A1Midrex Technologies, Inc.
- Systems and methods for direct reduction of iron ore24 Sep 2026US 2026/0287255 A1Uchicago Argonne, LLC
- Plant and mehtod for the production of direct reduced iron10 Sep 2026US 2026/0265847 A1Danieli & C. Officine Meccaniche SpA
- Cooling gas recirculation in the upper reduction zone of a direct reduction shaft furnace10 Sep 2026US 2026/0265848 A1Midrex Technologies, Inc.
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
- Blast furnace iron production with integrated power generation70US 8,133,298 B2Air Products and Chemicals, Inc. · 2012
- Method for producing molten iron by submerged combustion69US 4,238,226 AMidrex Corporation · 1980