C21B 13/0093
Protecting against oxidation
Official title: {Protecting against oxidation}
C21B13/0093 (Protecting against oxidation) appears on 40 US grants and 34 published applications in this corpus.
Search patents in C21B- Granted patents
- 40
- Published applications
- 34
- Assignees
- 28
- Inventors
- 81
- Latest grant
- 5 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 0 | 1 |
| 2010 | 1 | 1 |
| 2011 | 0 | 1 |
| 2012 | 3 | 3 |
| 2013 | 2 | 2 |
| 2014 | 2 | 3 |
| 2015 | 3 | 1 |
| 2016 | 2 | 0 |
| 2017 | 1 | 1 |
| 2018 | 0 | 1 |
| 2019 | 0 | 1 |
| 2020 | 2 | 3 |
| 2021 | 2 | 2 |
| 2022 | 2 | 3 |
| 2023 | 1 | 2 |
| 2024 | 1 | 3 |
| 2025 | 4 | 3 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Sealing a reduction assembly5 Aug 2025US 12,378,616 B2Primetals Technologies Austria GmbH
- Method for the direct reduction of iron ore29 Apr 2025US 12,286,679 B2ThyssenKrupp Steel Europe AG
- Process for the smelting of a metalliferous feedstock material4 Mar 2025US 12,241,133 B2African Rainbow Minerals Limited
- Method and device for producing direct reduced, carburized metal11 Feb 2025US 12,221,659 B2Greeniron H2 AB
- Method for carburization of HDRI produced in H2 based direct reduction process31 Dec 2024US 12,180,554 B2Primetals Technologies Austria GmbH
- Method for manufacturing direct reduced iron with a low carbon content2 Jul 2026US 2026/0185172 A1
- Method and configuration for producing reduced metal material10 Jul 2025US 2025/0223661 A1Luossavaara-Kiirunavaara AB
- Method and device for producing direct reduced metal3 Apr 2025US 2025/0109450 A1Greeniron H2 AB
- Method for reducing carbon footprint in operating a metallurgical plant for producing pig iron9 Jan 2025US 2025/0011888 A1Paul Wurth S. A.
- Iron briquettes19 Sep 2024US 2024/0309478 A1HYBRIT Development AB
Most cited
By later US patents
- Compacted, passivated metallized iron product12US 4,093,455 AMidrex Corporation · 1978
- Method for continuous passivation of sponge iron material11US 4,076,520 AMidrex Corporation · 1978
- Hot discharge direct reduction furnace9US 4,188,022 AMidrex Corporation · 1980
- Direct reduced iron discharge system and method9US 6,214,086 B1Midrex International B.V. Rotterdam, Zurich Branch · 2001
- Briquet sheet breaking by cooling and bending8US 4,165,978 AMidrex Corporation · 1979