C21B 7/04
Blast furnaces: with special refractories
Official title: with special refractories
C21B7/04 (Blast furnaces: with special refractories) appears on 98 US grants and 76 published applications in this corpus.
Search patents in C21B- Granted patents
- 98
- Published applications
- 76
- Assignees
- 84
- Inventors
- 234
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 4 | 0 |
| 1982 | 4 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 5 | 0 |
| 1999 | 9 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 1 |
| 2003 | 0 | 2 |
| 2004 | 0 | 2 |
| 2005 | 2 | 1 |
| 2006 | 2 | 2 |
| 2007 | 1 | 6 |
| 2008 | 1 | 0 |
| 2009 | 1 | 2 |
| 2010 | 2 | 4 |
| 2011 | 0 | 4 |
| 2012 | 2 | 7 |
| 2013 | 4 | 6 |
| 2014 | 4 | 2 |
| 2015 | 2 | 2 |
| 2016 | 3 | 3 |
| 2017 | 5 | 3 |
| 2018 | 2 | 2 |
| 2019 | 2 | 6 |
| 2020 | 5 | 3 |
| 2021 | 1 | 3 |
| 2022 | 2 | 4 |
| 2023 | 1 | 3 |
| 2024 | 2 | 3 |
| 2025 | 3 | 2 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- System and method for measuring the thickness of refractories19 May 2026US 12,631,447 B2Saint-Gobain do Brasil Produtos Industriais e Para Construção Ltda.
- Foundry component having an anticorrosion layer structure23 Dec 2025US 12,502,706 B2Oskar Frech GmbH + Co. KG
- Method for monitoring the wear of a refractory lining of a blast furnace8 Apr 2025US 12,270,606 B2ArcelorMittal
- Method for protecting an inner wall of a shaft furnace25 Feb 2025US 12,235,047 B2Paul Wurth S. A.
- Integrated heated member management system and method for controlling same26 Mar 2024US 11,940,218 B2Excello Co., Ltd.
- Blast furnace lining having improved thermal conductivity and use life2 Jul 2026US 2026/0185170 A1Magneco/Metrel, Inc.
- Refractory lining disposed on the bottom of a metallurgical unit for holding a molten metal, method of providing a refractory lining disposed on the bottom of a metallurgical unit for holding a molten metal, and metallurgical unit for holding a molten metal2 Jul 2026US 2026/0185774 A1Refractory Intellectual Property GmbH & Co.KG
- Method of lining a blast furnace2 Jul 2026US 2026/0185778 A1Magneco/Metrel, Inc.
- Installation for applying a lining composition in the form of dry particulate material to form a working lining onto a permanent refractory layer of a tundish23 Oct 2025US 2025/0326031 A1Vesuvius Group S. A.
- Refractory layer structures and assemblies for vessels exposed to molten materials31 Jul 2025US 2025/0244077 A1HarbisonWalker International Holdings, Inc.
Most cited
By later US patents
- Anchor system for refractory lining34US 8,383,055 B2Palmer Linings Pty Ltd. · 2013
- Work-facilitating apparatus for lining converters, metallurgical furnaces, holding vessels and like equipment31US 4,033,463 ACervinter AB · 1977
- Refractory lining system for high wear area of high temperature reaction vessel24US 5,741,349 ASteel Technology, LLC · 1998
- Turbine blade for use in a gas turbine20US 7,540,710 B2Siemens Aktiengesellschaft · 2009
- Method of monitoring the wear of refractory walls of a blast furnace and temperature probe used for the method17US 4,358,953 AKobe Steel, Ltd. · 1982