C21B 3/02
General features in the manufacture of pig-iron: by applying additives
Official title: by applying additives, e.g. fluxing agents
C21B3/02 (General features in the manufacture of pig-iron: by applying additives) appears on 18 US grants and 35 published applications in this corpus.
Search patents in C21B- Granted patents
- 18
- Published applications
- 35
- Assignees
- 35
- Inventors
- 86
- Latest grant
- 5 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 4 |
| 2015 | 3 | 2 |
| 2016 | 1 | 2 |
| 2017 | 1 | 3 |
| 2018 | 2 | 2 |
| 2019 | 1 | 0 |
| 2020 | 1 | 1 |
| 2021 | 0 | 1 |
| 2022 | 0 | 2 |
| 2023 | 0 | 2 |
| 2024 | 2 | 6 |
| 2025 | 2 | 1 |
| 2026 | 0 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for iron making by continuous smelting reduction5 Aug 2025US 12,378,614 B2Dongda Nonferrous Solid Waste Technology Research Institute (Liaoling) Co., Ltd
- Process for preparation and use of inorganic markers for security identification/marking on explosives, fuses and ammunition after detonation and on firearms and metal projectiles, products obtained and process of inserting markers on explosives, fuses and ammunition and on firearms and metal projectiles15 Apr 2025US 12,276,001 B2Meta - SoluçõEs Em SegurançA Ltda.
- Method of manufacturing iron in a metallurgical vessel24 Dec 2024US 12,173,376 B2Tata Steel Nederland Technology B.V.
- System and method for the production of hot briquetted iron (HBI) containing flux and/or carbonaceous material at a direct reduction plant4 Jun 2024US 12,000,011 B2Midrex Technologies, Inc.
- Cokeless sinter blend compositions7 Jul 2020US 10,704,119 B2Nu-Iron Technology, LLC
- Novel process for the smelting of a blend of hot and cold metalliferous feedstock material yielding reduced carbon emissions1 Oct 2026US 2026/0297695 A1Metix (Proprietary) Limited
- Additive composition and method for chemically adjusting molten metal11 Jun 2026US 2026/0159908 A1Hatch Ltd.
- Sulfur management in a smelting process21 May 2026US 2026/0139336 A1Nucor Corporation
- Method of producing hot metal using solid-reducing furnace and submerged arc furnace12 Mar 2026US 2026/0071286 A1Jfe Steel Corporation
- Method of producing reduced iron12 Mar 2026US 2026/0071287 A1Jfe Steel Corporation
Most cited
By later US patents
- Method for the treatment of red mud7US 3,989,513 AMagyar Aluminiumipari Troszt · 1976
- Low cost method of fluidizing cupola slag (A)6US 4,137,071 AFord Motor Company · 1979
- Briquette as an additive for metallurgic purposes comprising silicon-containing residues, and process for its production3US 5,993,508 AElkem ASA · 1999
- Process for treating moist compositions containing pollution-causing substances2US 4,398,956 APelt & Hooykaas B.V. · 1983
- Method for recovering valuable metals2US 9,203,126 B2Sumitomo Metal Mining Co., Ltd. · 2015