C22B 21/02
Obtaining aluminium: with reducing
Official title: with reducing {(C22B21/04 takes precedence)}
C22B21/02 (Obtaining aluminium: with reducing) appears on 83 US grants and 52 published applications in this corpus.
Search patents in C22B- Granted patents
- 83
- Published applications
- 52
- Assignees
- 46
- Inventors
- 154
- Latest grant
- 7 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 4 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 6 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 5 | 0 |
| 1984 | 5 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 8 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 3 | 2 |
| 2003 | 1 | 0 |
| 2004 | 1 | 1 |
| 2005 | 2 | 6 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 4 |
| 2009 | 1 | 5 |
| 2010 | 6 | 4 |
| 2011 | 1 | 3 |
| 2012 | 0 | 0 |
| 2013 | 1 | 1 |
| 2014 | 1 | 2 |
| 2015 | 3 | 5 |
| 2016 | 0 | 1 |
| 2017 | 4 | 0 |
| 2018 | 0 | 4 |
| 2019 | 0 | 1 |
| 2020 | 2 | 0 |
| 2021 | 3 | 0 |
| 2022 | 0 | 2 |
| 2023 | 0 | 2 |
| 2024 | 0 | 5 |
| 2025 | 2 | 1 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Process for recovering materials from bauxite residue, microwave reactor for heating mining products and method for heating a mining product7 Apr 2026US 12,595,185 B2New Wave Royalties Sociedad Anonima
- Bauxite processing method5 Aug 2025US 12,378,632 B2
- Method for recovering active metal of lithium secondary battery28 Jan 2025US 12,211,979 B2SK Innovation Co., Ltd.
- Method for producing aluminum-scandium alloy and reactor for implementing the method30 Nov 2021US 11,186,897 B2United Company RUSAL Engineering and Technology Centre LLC
- Method for recovery of metal-containing material from a composite material2 Nov 2021US 11,162,157 B2Coogee Titanium Pty Ltd
- Process for recovering materials from bauxite residue, microwave reactor for heating mining products and method for heating a mining product4 Jun 2026US 2026/0152407 A1New Wave Royalties Sociedad Anonima
- Method for extracting aluminum23 Apr 2026US 2026/0110053 A1Hyundai Motor Company
- Method and system for recycling metal of lithium secondary battery3 Jul 2025US 2025/0215522 A1SK Innovation Co., Ltd.
- Aluminum production powered by geothermal energy3 Oct 2024US 2024/0327949 A1EnhancedGEO Holdings, LLC
- Method for recovery of metal-containing material from a composite material11 Jul 2024US 2024/0229189 A9Coogee Titanium Pty Ltd
Most cited
By later US patents
- Process for the production of aluminium21US 4,099,959 AAlcan Research and Development Limited · 1978
- Reduction of stable oxides21US 4,177,060 ATetronics Research and Development Co. Ltd. · 1979
- Method of producing aluminum20US 4,385,930 AReynolds Metals Company · 1983
- Carbothermic production of aluminum17US 3,971,653 AAluminum Company of America · 1976
- Aluminum purification system17US 4,216,010 AReynolds Metals Company · 1980