C21B 15/00
Manufacture of iron or steel: other processes for the manufacture of iron
Official title: Other processes for the manufacture of iron from iron compounds (by electrolysis C25C1/06)
C21B15/00 (Manufacture of iron or steel: other processes for the manufacture of iron) appears on 129 US grants and 136 published applications in this corpus.
Search patents in C21B- Granted patents
- 129
- Published applications
- 136
- Assignees
- 101
- Inventors
- 372
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 5 | 0 |
| 1980 | 2 | 0 |
| 1981 | 5 | 0 |
| 1982 | 7 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 4 | 2 |
| 2002 | 2 | 1 |
| 2003 | 1 | 1 |
| 2004 | 2 | 2 |
| 2005 | 0 | 2 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 3 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 2 | 30 |
| 2015 | 4 | 14 |
| 2016 | 19 | 18 |
| 2017 | 10 | 8 |
| 2018 | 12 | 4 |
| 2019 | 6 | 4 |
| 2020 | 5 | 1 |
| 2021 | 1 | 1 |
| 2022 | 3 | 5 |
| 2023 | 3 | 11 |
| 2024 | 6 | 9 |
| 2025 | 5 | 9 |
| 2026 | 3 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Ore dissolution and iron conversion system17 Mar 2026US 12,577,696 B2Electrasteel, Inc.
- Process for producing hydrogen and graphitic carbon from hydrocarbons17 Feb 2026US 12,552,666 B2Hazer Group Ltd.
- Method and electrochemical system for recycling spent lithium-ion battery17 Feb 2026US 12,553,142 B2East China University of Science and Technology
- Production of iron30 Dec 2025US 12,509,745 B2Technological Resources Pty. Limited
- Impurity removal in an iron conversion system7 Oct 2025US 12,435,437 B2Electrasteel, Inc.
- Sodium-based metal production system6 Aug 2026US 2026/0226584 A1Helios Project Ltd.
- A process for transition metal oxide reduction30 Jul 2026US 2026/0218323 A1Helios Project Ltd.
- Process and plant for slag treatment23 Jul 2026US 2026/0209874 A1Danieli & C. Officine Meccaniche SpA
- Processes for recovering metallic iron from source material9 Jul 2026US 2026/0193727 A1CVMR Corporation
- Electrolysis apparatus for the production of iron with an improved gas permeable anode plate9 Jul 2026US 2026/0193804 A1
Most cited
By later US patents
- Chemical synthesis of monodisperse and magnetic alloy nanocrystal containing thin films46US 6,254,662 B1International Business Machines Corporation · 2001
- Process for recovery of metals from metal-containing ores33US 6,395,062 B2Cognis Corporation · 2002
- Process for recovering mineral values from fly ash26US 4,130,627 A1978
- Method for direct metal making by microwave energy25US 6,277,168 B12001
- Process for the production of high surface area tantalum and/or niobium powders24US 6,786,951 B2Ningxia Orient Tantalum Industry Co., Ltd. · 2004