C21B 7/00
Blast furnaces
C21B7/00 (Blast furnaces) appears on 988 US grants and 619 published applications in this corpus.
Search patents in C21B- Granted patents
- 988
- Published applications
- 619
- Assignees
- 477
- Inventors
- 2,017
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 22 | 0 |
| 1977 | 48 | 0 |
| 1978 | 36 | 0 |
| 1979 | 34 | 0 |
| 1980 | 29 | 0 |
| 1981 | 33 | 0 |
| 1982 | 34 | 0 |
| 1983 | 35 | 0 |
| 1984 | 21 | 0 |
| 1985 | 19 | 0 |
| 1986 | 24 | 0 |
| 1987 | 18 | 0 |
| 1988 | 14 | 0 |
| 1989 | 26 | 0 |
| 1990 | 17 | 0 |
| 1991 | 21 | 0 |
| 1992 | 11 | 0 |
| 1993 | 19 | 0 |
| 1994 | 14 | 0 |
| 1995 | 18 | 0 |
| 1996 | 13 | 0 |
| 1997 | 12 | 0 |
| 1998 | 14 | 0 |
| 1999 | 20 | 0 |
| 2000 | 18 | 0 |
| 2001 | 19 | 6 |
| 2002 | 14 | 5 |
| 2003 | 14 | 11 |
| 2004 | 12 | 12 |
| 2005 | 9 | 6 |
| 2006 | 4 | 14 |
| 2007 | 5 | 25 |
| 2008 | 3 | 20 |
| 2009 | 10 | 18 |
| 2010 | 12 | 28 |
| 2011 | 21 | 46 |
| 2012 | 21 | 33 |
| 2013 | 26 | 21 |
| 2014 | 27 | 26 |
| 2015 | 24 | 36 |
| 2016 | 14 | 34 |
| 2017 | 25 | 19 |
| 2018 | 27 | 22 |
| 2019 | 19 | 27 |
| 2020 | 25 | 15 |
| 2021 | 10 | 21 |
| 2022 | 14 | 31 |
| 2023 | 7 | 29 |
| 2024 | 15 | 36 |
| 2025 | 26 | 44 |
| 2026 | 15 | 34 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C21B 7/10Cooling158
- C21B 7/18Bell-and-hopper arrangements156
- C21B 7/12Opening or sealing the tap holes135
- C21B 7/24Test rods or other checking devices132
- C21B 7/16Tuyéres131
- C21B 7/14Discharging devices111
- C21B 7/04Blast furnaces: with special refractories98
- C21B 7/002Evacuating and treating of exhaust gases93
Recent patents
- System and method for measuring cooling plate thickness in a blast furnace25 Aug 2026US 12,716,717 B2Paul Wurth S. A.
- Blast furnace distributing device with nitrogen sealing structure4 Aug 2026US 12,698,540 B2
- Method for operating a blast furnace plant23 Jun 2026US 12,663,212 B2Paul Wurth S. A.
- System and method for measuring the thickness of refractories19 May 2026US 12,631,447 B2Saint-Gobain do Brasil Produtos Industriais e Para Construção Ltda.
- Optimal calculation method of energy operating condition in iron mill, optimal calculation device of energy operating condition in iron mill, and running method of iron mill12 May 2026US 12,624,403 B2Jfe Steel Corporation
- Estimating element content in molten material at openings of metallurgical vessels8 Oct 2026US 2026/0309629 A1Paul Wurth S. A.
- Estimating element content in molten material at openings of metallurgical vessels8 Oct 2026US 2026/0309630 A1Paul Wurth S. A.
- Tuyere for a metallurgical furnace1 Oct 2026US 2026/0297694 A1Paul Wurth S. A.
- Iron ore reducing and melting apparatus and method24 Sep 2026US 2026/0286453 A1Paul Wurth S. A.
- Ironmaking method and associated plant17 Sep 2026US 2026/0275433 A1
Most cited
By later US patents
- Process for making refractory shapes119US 4,150,078 ALava Crucible Refractories Company · 1979
- Apparatus and method for tapping a reactor containing a molten fluid110US 5,690,888 AMolten Metal Technologies, Inc. · 1997
- Blast furnace iron production with integrated power generation70US 8,133,298 B2Air Products and Chemicals, Inc. · 2012
- Method and apparatus for sampling measurement data from a chemical process50US 4,590,466 APharos AB · 1986
- Heat exchanger37US 7,901,617 B2Auckland Uniservices Limited · 2011