C21B 5/06
Making pig-iron in the blast furnace: using top gas in the blast
Official title: using top gas in the blast furnace process
C21B5/06 (Making pig-iron in the blast furnace: using top gas in the blast) appears on 80 US grants and 125 published applications in this corpus.
Search patents in C21B- Granted patents
- 80
- Published applications
- 125
- Assignees
- 76
- Inventors
- 292
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 4 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 4 |
| 2011 | 0 | 5 |
| 2012 | 3 | 8 |
| 2013 | 4 | 4 |
| 2014 | 5 | 12 |
| 2015 | 7 | 5 |
| 2016 | 2 | 10 |
| 2017 | 5 | 5 |
| 2018 | 6 | 1 |
| 2019 | 2 | 2 |
| 2020 | 7 | 2 |
| 2021 | 1 | 3 |
| 2022 | 1 | 8 |
| 2023 | 2 | 13 |
| 2024 | 1 | 18 |
| 2025 | 9 | 15 |
| 2026 | 5 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hydrogen-rich blast furnace ironmaking system based on mass-energy conversion, and production control method therefor5 May 2026US 12,618,119 B2Changli County Xingguo Precision Machine Parts Co., Ltd.
- 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 operating an electric arc furnace and steel mill24 Mar 2026US 12,584,182 B2Paul Wurth S. A.
- Steelmaking line and method of producing reduced iron27 Jan 2026US 12,534,770 B2Jfe Steel Corporation
- Solid carbon production device and solid carbon production method20 Jan 2026US 12,528,701 B2Mitsubishi Heavy Industries, Ltd.
- Systematic carbon emissions reduction method for whole process of production and casting3 Sep 2026US 2026/0258513 A1Jiqing Low Carbon Technology (Qinhuangdao) Co., Ltd.
- Method and system for decarbonizing a process involving combustion of hydrocarbon-based fuel27 Aug 2026US 2026/0250852 A1
- Method of producing reduced iron16 Jul 2026US 2026/0201485 A1Jfe Steel Corporation
- Blast furnace gas pressure swing adsorption carbon dioxide capture system coupled with compressed energy storage9 Jul 2026US 2026/0192238 A1Hebei Chuangjie Environmental Protection Engineering Co., Ltd.
- Method for operating a smelting furnace installation28 May 2026US 2026/0146300 A1Paul Wurth S. A.
Most cited
By later US patents
- Blast furnace iron production with integrated power generation70US 8,133,298 B2Air Products and Chemicals, Inc. · 2012
- Production of reducing gas for furnace injection22US 4,363,654 A1982
- Method for integrating a blast furnace and a direct reduction reactor using cryogenic rectification19US 6,045,602 APraxair Technology, Inc. · 2000
- Method for producing reduction gases consisting essentially of carbon monoxide and hydrogen9US 4,220,469 AFirma Carl Still GmbH & Co. KG · 1980
- Operating a blast furnace using dried top gas9US 5,234,490 AArmco Inc. · 1993