C21B 13/02
In shaft furnaces
Official title: in shaft furnaces
C21B13/02 (In shaft furnaces) appears on 233 US grants and 183 published applications in this corpus.
Search patents in C21B- Granted patents
- 233
- Published applications
- 183
- Assignees
- 97
- Inventors
- 483
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 15 | 0 |
| 1978 | 5 | 0 |
| 1979 | 8 | 0 |
| 1980 | 10 | 0 |
| 1981 | 10 | 0 |
| 1982 | 7 | 0 |
| 1983 | 6 | 0 |
| 1984 | 3 | 0 |
| 1985 | 5 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 9 | 0 |
| 1989 | 4 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 5 | 0 |
| 2001 | 9 | 3 |
| 2002 | 9 | 4 |
| 2003 | 6 | 3 |
| 2004 | 0 | 1 |
| 2005 | 0 | 4 |
| 2006 | 1 | 4 |
| 2007 | 2 | 1 |
| 2008 | 0 | 1 |
| 2009 | 4 | 4 |
| 2010 | 3 | 4 |
| 2011 | 1 | 5 |
| 2012 | 2 | 10 |
| 2013 | 3 | 5 |
| 2014 | 7 | 14 |
| 2015 | 11 | 10 |
| 2016 | 9 | 12 |
| 2017 | 9 | 4 |
| 2018 | 8 | 2 |
| 2019 | 5 | 2 |
| 2020 | 2 | 5 |
| 2021 | 4 | 7 |
| 2022 | 1 | 4 |
| 2023 | 3 | 12 |
| 2024 | 5 | 22 |
| 2025 | 7 | 22 |
| 2026 | 3 | 18 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for manufacturing direct reduced iron and DRI manufacturing equipment6 Oct 2026US 12,753,452 B2ArcelorMittal
- Process for the production of carburized sponge iron28 Jul 2026US 12,692,563 B2HYBRIT Development AB
- Method for producing reduced iron7 Apr 2026US 12,595,522 B2Nippon Steel Corporation
- Method and corresponding apparatus for producing iron from direct reduction of iron ore30 Dec 2025US 12,509,738 B2Danieli & C. Officine Meccaniche SpA
- Hot metal production from DRI with electric arc heating16 Dec 2025US 12,497,668 B2Kobe Steel, Ltd.
- Method of producing reduced iron8 Oct 2026US 2026/0308705 A1Jfe Steel Corporation
- Cold water, wide range wet venturi scrubber for a direct reduction plant1 Oct 2026US 2026/0297696 A1Midrex Technologies, Inc.
- Systems and methods for direct reduction of iron ore24 Sep 2026US 2026/0287255 A1Uchicago Argonne, LLC
- Method for producing molten pig iron17 Sep 2026US 2026/0275434 A1Jfe Steel Corporation
- Plant and mehtod for the production of direct reduced iron10 Sep 2026US 2026/0265847 A1Danieli & C. Officine Meccaniche SpA
Most cited
By later US patents
- Method for the direct reduction of iron ore61US 4,160,663 A1979
- Method for the gaseous reduction of metal ores using reducing gas produced by gasification of solid or liquid fossil fuels50US 4,246,024 AGrupo Industrial Alfa, S.A. · 1981
- System and method for reducing iron oxide to metallic iron using coke oven gas and oxygen steelmaking furnace gas49US 8,685,136 B2Midrex Technologies, Inc. · 2014
- Method and apparatus for producing reformed gases48US 6,524,356 B2Midrex Technologies, Inc. · 2003
- Method for the direct reduction of iron using gas from coal41US 4,173,465 AMidrex Corporation · 1979