C21B 13/0073
Selection or treatment of the reducing gases
Official title: {Selection or treatment of the reducing gases}
C21B13/0073 (Selection or treatment of the reducing gases) appears on 273 US grants and 354 published applications in this corpus.
Search patents in C21B- Granted patents
- 273
- Published applications
- 354
- Assignees
- 186
- Inventors
- 734
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 12 | 0 |
| 1978 | 6 | 0 |
| 1979 | 10 | 0 |
| 1980 | 11 | 0 |
| 1981 | 10 | 0 |
| 1982 | 13 | 0 |
| 1983 | 5 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 8 | 0 |
| 2000 | 6 | 0 |
| 2001 | 2 | 1 |
| 2002 | 4 | 7 |
| 2003 | 8 | 2 |
| 2004 | 1 | 4 |
| 2005 | 1 | 2 |
| 2006 | 1 | 6 |
| 2007 | 2 | 2 |
| 2008 | 2 | 2 |
| 2009 | 2 | 10 |
| 2010 | 4 | 10 |
| 2011 | 5 | 5 |
| 2012 | 6 | 12 |
| 2013 | 8 | 6 |
| 2014 | 6 | 13 |
| 2015 | 7 | 10 |
| 2016 | 5 | 12 |
| 2017 | 9 | 7 |
| 2018 | 7 | 11 |
| 2019 | 9 | 6 |
| 2020 | 6 | 7 |
| 2021 | 8 | 12 |
| 2022 | 3 | 22 |
| 2023 | 13 | 35 |
| 2024 | 14 | 68 |
| 2025 | 23 | 41 |
| 2026 | 11 | 41 |
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
- Process for the production of carburized sponge iron28 Jul 2026US 12,692,563 B2HYBRIT Development AB
- Direct reduced iron system and method21 Jul 2026US 12,686,893 B2Nucor Corporation
- Direct reduction of iron by hydrogen plasma in a rotary kiln reactor5 May 2026US 12,618,120 B2Uchicago Argonne, LLC
- Systems and methods for steel production14 Apr 2026US 12,601,020 B2Pathfinder Holdings Corp.
- 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
- Method for operating a plant network17 Sep 2026US 2026/0275435 A1ThyssenKrupp Steel Europe AG
- Methods for reducing metal oxides with ammonia gas10 Sep 2026US 2026/0265846 A1Trustees of Tufts College
- Plant and mehtod for the production of direct reduced iron10 Sep 2026US 2026/0265847 A1Danieli & C. Officine Meccaniche SpA
Most cited
By later US patents
- 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
- Method for co-producing fuel and iron59US 5,529,599 A1996
- Rotating fluidized bed hydrogen production system54US 4,343,624 ACaterpillar Tractor Co. · 1982
- 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