C21B 5/00
Making pig-iron in the blast furnace
C21B5/00 (Making pig-iron in the blast furnace) appears on 553 US grants and 461 published applications in this corpus.
Search patents in C21B- Granted patents
- 553
- Published applications
- 461
- Assignees
- 291
- Inventors
- 1,318
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 11 | 0 |
| 1977 | 11 | 0 |
| 1978 | 12 | 0 |
| 1979 | 12 | 0 |
| 1980 | 8 | 0 |
| 1981 | 12 | 0 |
| 1982 | 13 | 0 |
| 1983 | 17 | 0 |
| 1984 | 17 | 0 |
| 1985 | 16 | 0 |
| 1986 | 13 | 0 |
| 1987 | 14 | 0 |
| 1988 | 12 | 0 |
| 1989 | 7 | 0 |
| 1990 | 9 | 0 |
| 1991 | 4 | 0 |
| 1992 | 6 | 0 |
| 1993 | 8 | 0 |
| 1994 | 3 | 0 |
| 1995 | 8 | 0 |
| 1996 | 13 | 0 |
| 1997 | 8 | 0 |
| 1998 | 12 | 0 |
| 1999 | 10 | 0 |
| 2000 | 13 | 0 |
| 2001 | 10 | 2 |
| 2002 | 5 | 3 |
| 2003 | 6 | 8 |
| 2004 | 6 | 7 |
| 2005 | 2 | 3 |
| 2006 | 2 | 3 |
| 2007 | 2 | 5 |
| 2008 | 2 | 4 |
| 2009 | 1 | 5 |
| 2010 | 5 | 14 |
| 2011 | 5 | 15 |
| 2012 | 10 | 21 |
| 2013 | 11 | 12 |
| 2014 | 14 | 19 |
| 2015 | 16 | 30 |
| 2016 | 9 | 21 |
| 2017 | 17 | 19 |
| 2018 | 16 | 10 |
| 2019 | 12 | 13 |
| 2020 | 17 | 14 |
| 2021 | 9 | 32 |
| 2022 | 10 | 38 |
| 2023 | 14 | 34 |
| 2024 | 15 | 56 |
| 2025 | 35 | 46 |
| 2026 | 33 | 27 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C21B 5/001Injecting additional fuel or reducing agents242
- C21B 5/007Conditions of the cokes or characterised by the cokes used96
- C21B 5/008Composition or distribution of the charge91
- C21B 5/06Making pig-iron in the blast furnace: using top gas in the blast80
- C21B 5/006Automatically controlling the process59
- C21B 5/02Making special pig-iron54
- C21B 5/04Making slag of special composition13
Recent patents
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- High-carbon biogenic reagents and uses thereof1 Sep 2026US 12,723,211 B2Carbon Technology Holdings, LLC
- Method for producing liquid pig iron from a DRI product25 Aug 2026US 12,716,105 B2SMS group GmbH
- Blast furnace—converter steel production method based on carbon cycling28 Jul 2026US 12,692,561 B2Cisdi Engineering Co., Ltd
- Foundry coke products and associated systems and processing methods via cupolas28 Jul 2026US 12,692,562 B2Suncoke Technology and Development LLC
- Systematic carbon emissions reduction method for whole process of production and casting3 Sep 2026US 2026/0258513 A1Jiqing Low Carbon Technology (Qinhuangdao) Co., Ltd.
- Sintered ore and method for producing same, and sintered ore for hydrogen reduction and method for producing same27 Aug 2026US 2026/0250798 A1Jfe Steel Corporation
- Method and system for decarbonizing a process involving combustion of hydrocarbon-based fuel27 Aug 2026US 2026/0250852 A1
- Hot metal temperature control method, hot metal temperature control device, hot metal temperature control system, and terminal device20 Aug 2026US 2026/0242883 A1Jfe Steel Corporation
- Furnace heat prediction data creation device and method therefor, and furnace heat prediction device and method therefor6 Aug 2026US 2026/0228384 A1Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
Most cited
By later US patents
- Process of using olivine in a blast furnace111US 3,966,456 AMolten Metal Engineering Co. · 1976
- Blast furnace iron production with integrated power generation70US 8,133,298 B2Air Products and Chemicals, Inc. · 2012
- Coal-water slurry and method for its preparation67US 4,282,006 AAlfred University Research Foundation, Inc. · 1981
- Process for producing high-carbon biogenic reagents65US 9,388,355 B2Biogenic Reagents Ventures, LLC · 2016
- Systems and apparatus for production of high-carbon biogenic reagents63US 9,388,046 B2Biogenic Reagents Ventures, LLC · 2016