C21B 13/008
Use of special additives or fluxing agents
Official title: {Use of special additives or fluxing agents}
C21B13/008 (Use of special additives or fluxing agents) appears on 72 US grants and 117 published applications in this corpus.
Search patents in C21B- Granted patents
- 72
- Published applications
- 117
- Assignees
- 66
- Inventors
- 243
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 3 | 1 |
| 2002 | 0 | 1 |
| 2003 | 0 | 1 |
| 2004 | 1 | 5 |
| 2005 | 2 | 1 |
| 2006 | 0 | 9 |
| 2007 | 1 | 5 |
| 2008 | 0 | 2 |
| 2009 | 3 | 5 |
| 2010 | 6 | 5 |
| 2011 | 4 | 7 |
| 2012 | 5 | 2 |
| 2013 | 2 | 5 |
| 2014 | 3 | 2 |
| 2015 | 3 | 6 |
| 2016 | 2 | 4 |
| 2017 | 1 | 3 |
| 2018 | 1 | 2 |
| 2019 | 4 | 3 |
| 2020 | 1 | 2 |
| 2021 | 1 | 2 |
| 2022 | 1 | 12 |
| 2023 | 1 | 8 |
| 2024 | 2 | 9 |
| 2025 | 3 | 5 |
| 2026 | 4 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for producing liquid pig iron from a DRI product25 Aug 2026US 12,716,105 B2SMS group GmbH
- Biocarbon pellets with adjustable grindability index16 Jun 2026US 12,655,362 B2Carbon Technology Holdings, LLC
- Biomass pyrolysis integrated with bio-reduction of metal ores, hydrogen production, and/or activated-carbon production9 Jun 2026US 12,649,959 B2Carbon Technology Holdings, LLC
- Method of introducing a metalliferous feed in an ironmaking process19 May 2026US 12,630,892 B2Tata Steel Ijmuiden B.V.
- Method for iron making by continuous smelting reduction5 Aug 2025US 12,378,614 B2Dongda Nonferrous Solid Waste Technology Research Institute (Liaoling) Co., Ltd
- Reoxidation retardant and method for hindering reoxidation of direct reduced iron8 Oct 2026US 2026/0308704 A1
- Method for refining metal27 Aug 2026US 2026/0250795 A1Ferrum Technologies FlexCo
- Method of producing reduced iron16 Jul 2026US 2026/0201485 A1Jfe Steel Corporation
- Method for melting direct reduced iron, solid iron and method for producing the same, and material for civil engineering and construction and method for producing the same2 Jul 2026US 2026/0185171 A1Jfe Steel Corporation
- Additive composition and method for chemically adjusting molten metal11 Jun 2026US 2026/0159908 A1Hatch Ltd.
Most cited
By later US patents
- Method for the direct reduction of iron ore61US 4,160,663 A1979
- Method for direct metal making by microwave energy25US 6,277,168 B12001
- Process of recycling iron oxides and plastics in steelmaking16US 5,554,207 AUSX Corporation · 1996
- Furnace hearth for improved molten iron production and method of operation13US 6,749,664 B1Midrex International B.V. Rotterdam, Zurich Branch · 2004
- Cold briquette of waste materials as an aggregate for smelting furnaces of an iron foundry and method of producing the same12US 5,912,403 AWishbone Investments Limited · 1999