C21B 11/02
In low shaft furnaces or shaft furnaces
Official title: in low shaft furnaces {or shaft furnaces}
C21B11/02 (In low shaft furnaces or shaft furnaces) appears on 55 US grants and 34 published applications in this corpus.
Search patents in C21B- Granted patents
- 55
- Published applications
- 34
- Assignees
- 50
- Inventors
- 154
- Latest grant
- 10 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 3 | 0 |
| 1979 | 4 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 2 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 1 |
| 2008 | 1 | 3 |
| 2009 | 1 | 1 |
| 2010 | 0 | 1 |
| 2011 | 1 | 0 |
| 2012 | 3 | 1 |
| 2013 | 1 | 2 |
| 2014 | 0 | 2 |
| 2015 | 1 | 1 |
| 2016 | 1 | 2 |
| 2017 | 2 | 2 |
| 2018 | 2 | 1 |
| 2019 | 1 | 0 |
| 2020 | 1 | 0 |
| 2021 | 0 | 2 |
| 2022 | 1 | 2 |
| 2023 | 1 | 2 |
| 2024 | 3 | 2 |
| 2025 | 0 | 3 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Process for producing raw steel and aggregate for production thereof10 Mar 2026US 12,571,062 B2ThyssenKrupp Steel Europe AG
- Direct reduction process utilizing hydrogen9 Apr 2024US 11,952,638 B2Midrex Technologies, Inc.
- Foundry coke products and associated processing methods via cupolas2 Apr 2024US 11,946,108 B2Suncoke Technology and Development LLC
- Oxygen injection for reformer feed gas for direct reduction process5 Mar 2024US 11,920,204 B2Midrex Technologies, Inc.
- Method for operating a metallurgical furnace28 Feb 2023US 11,591,662 B2Paul Wurth S. A.
- Method and system for the production of different products under different reduction conditions in different portions of a shaft furnace27 Aug 2026US 2026/0250790 A1Midrex Technologies, Inc.
- A method for manufacturing pig iron in an electrical smelting furnace and associated furnace25 Jun 2026US 2026/0176708 A1
- Method for producing molten pig iron5 Jun 2025US 2025/0179594 A1Jfe Steel Corporation
- Method for manufacturing carbonaceous material-containing agglomerate ore, and method for manufacturing molten pig iron1 May 2025US 2025/0137080 A1Jfe Steel Corporation
- Method for reducing carbon footprint in operating a metallurgical plant for producing pig iron9 Jan 2025US 2025/0011888 A1Paul Wurth S. A.
Most cited
By later US patents
- Method of melting and apparatus therefor20US 4,097,028 AKlockner-Werke AG · 1978
- Method of producing metal from metal oxides15US 4,072,504 AAktiebolaget Svenska Kullagerfabriken · 1978
- Waste heat recovery apparatus14US 4,340,207 ADravo Corporation · 1982
- Waste heat recovery process and apparatus11US 4,257,579 AAmerican Hydrotherm Corporation · 1981
- Method for manufacturing molten pig iron11US 5,084,093 ASumitomo Metal Industries, Ltd. · 1992