C21B 9/00
Stoves for heating the blast in blast furnaces
C21B9/00 (Stoves for heating the blast in blast furnaces) appears on 135 US grants and 68 published applications in this corpus.
Search patents in C21B- Granted patents
- 135
- Published applications
- 68
- Assignees
- 78
- Inventors
- 288
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 7 | 0 |
| 1978 | 4 | 0 |
| 1979 | 7 | 0 |
| 1980 | 4 | 0 |
| 1981 | 7 | 0 |
| 1982 | 9 | 0 |
| 1983 | 4 | 0 |
| 1984 | 9 | 0 |
| 1985 | 4 | 0 |
| 1986 | 4 | 0 |
| 1987 | 3 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 6 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 3 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 2 |
| 2008 | 0 | 2 |
| 2009 | 0 | 2 |
| 2010 | 0 | 5 |
| 2011 | 3 | 6 |
| 2012 | 0 | 12 |
| 2013 | 6 | 2 |
| 2014 | 3 | 4 |
| 2015 | 9 | 3 |
| 2016 | 1 | 4 |
| 2017 | 3 | 2 |
| 2018 | 4 | 2 |
| 2019 | 3 | 1 |
| 2020 | 0 | 0 |
| 2021 | 1 | 0 |
| 2022 | 0 | 3 |
| 2023 | 0 | 3 |
| 2024 | 0 | 4 |
| 2025 | 7 | 6 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Support assembly in a heat storage device17 Mar 2026US 12,578,144 B2Paul Wurth Deutschland GmbH
- Thermal energy storage systems for use in material processing20 Jan 2026US 12,529,327 B2Rondo Energy, Inc.
- Thermal energy storage systems for use in material processing30 Dec 2025US 12,510,006 B2Rondo Energy, Inc.
- Thermal energy storage systems for use in material processing2 Dec 2025US 12,486,789 B2Rondo Energy, Inc.
- Blast furnace operation method5 Aug 2025US 12,378,615 B2Jfe Steel Corporation
- Combustion control method and combustion control device for hot blast stove18 Jun 2026US 2026/0168451 A1Jfe Steel Corporation
- Thermal energy storage systems for use in material processing2 Apr 2026US 2026/0092542 A1Rondo Energy, Inc.
- Interlocking refractory bricks and refractory layer structures formed therewith31 Jul 2025US 2025/0243101 A1HarbisonWalker International Holdings, Inc.
- Refractory layer structures and assemblies for vessels exposed to molten materials31 Jul 2025US 2025/0244077 A1HarbisonWalker International Holdings, Inc.
- Thermal energy storage systems for use in material processing20 Mar 2025US 2025/0092800 A1Rondo Energy, Inc.
Most cited
By later US patents
- Ceramic gas burner for a hot blast stove, and bricks therefor97US 5,052,922 AHoogovens Groep B.V. · 1991
- Method and apparatus for monitoring temperature of blast furnace and temperature control system using temperature monitoring apparatus21US 5,356,220 AKawasaki Steel Corporation · 1994
- Variable temperature waste heat recovery system19US 4,628,869 AUnited States Steel Corporation · 1986
- Swirling burners for use in hot blast stoves17US 4,054,409 ANippon Kokan Kabushiki Kaisha · 1977
- Valve system and improved actuator therefor15US 4,158,367 AS. A. des Anciens Etablissements Paul Wurth · 1979