C22B 21/00
Obtaining aluminium
C22B21/00 (Obtaining aluminium) appears on 1,178 US grants and 847 published applications in this corpus.
Search patents in C22B- Granted patents
- 1,178
- Published applications
- 847
- Assignees
- 644
- Inventors
- 2,442
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 25 | 0 |
| 1977 | 39 | 0 |
| 1978 | 25 | 0 |
| 1979 | 24 | 0 |
| 1980 | 19 | 0 |
| 1981 | 30 | 0 |
| 1982 | 18 | 0 |
| 1983 | 31 | 0 |
| 1984 | 32 | 0 |
| 1985 | 21 | 0 |
| 1986 | 17 | 0 |
| 1987 | 18 | 0 |
| 1988 | 28 | 0 |
| 1989 | 24 | 0 |
| 1990 | 20 | 0 |
| 1991 | 22 | 0 |
| 1992 | 24 | 0 |
| 1993 | 18 | 0 |
| 1994 | 32 | 0 |
| 1995 | 24 | 0 |
| 1996 | 12 | 0 |
| 1997 | 17 | 0 |
| 1998 | 28 | 0 |
| 1999 | 25 | 0 |
| 2000 | 36 | 0 |
| 2001 | 35 | 11 |
| 2002 | 31 | 23 |
| 2003 | 25 | 23 |
| 2004 | 17 | 26 |
| 2005 | 14 | 21 |
| 2006 | 7 | 24 |
| 2007 | 8 | 15 |
| 2008 | 12 | 28 |
| 2009 | 17 | 36 |
| 2010 | 29 | 34 |
| 2011 | 14 | 28 |
| 2012 | 27 | 22 |
| 2013 | 16 | 28 |
| 2014 | 20 | 33 |
| 2015 | 22 | 45 |
| 2016 | 29 | 43 |
| 2017 | 29 | 32 |
| 2018 | 27 | 25 |
| 2019 | 27 | 16 |
| 2020 | 31 | 27 |
| 2021 | 22 | 25 |
| 2022 | 15 | 39 |
| 2023 | 17 | 57 |
| 2024 | 22 | 68 |
| 2025 | 26 | 65 |
| 2026 | 30 | 53 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C22B 21/06Refining481
- C22B 21/0084Melting and handling molten aluminium309
- C22B 21/0038Obtaining aluminium: by other processes239
- C22B 21/0015Obtaining aluminium: by wet processes157
- C22B 21/0007Preliminary treatment of ores or scrap or any other metal source125
- C22B 21/02Obtaining aluminium: with reducing83
- C22B 21/04Obtaining aluminium: with alkali metals earth alkali metals included22
Recent patents
- Enhanced dross feedstock29 Sep 2026US 12,747,485 B2Novelis Inc.
- Method for recovering lithium and method for processing lithium ion secondary battery22 Sep 2026US 12,744,261 B2Dowa Eco-System Co., Ltd.
- Method for recovering valuable substance15 Sep 2026US 12,735,767 B2Dowa Eco-System Co., Ltd.
- Converting intermittent solar and wind produced electricity to 24/7 grid electricity via on-demand aluminum energy storage and its conversion back to economically competitive 24/7 local grid electricity1 Sep 2026US 12,723,541 B1
- Method for recovering valuable substance25 Aug 2026US 12,716,112 B2Dowa Eco-System Co., Ltd.
- Lime and hydraulic cement manufacture by electrolysis using hyaloclastite or lava, carbon mineralization by hyaloclastite or lava electrolysis and method of making and using same8 Oct 2026US 2026/0308006 A1Greencraft LLC
- Apparatus and method for fractionating alloy components in recycled alloy8 Oct 2026US 2026/0308715 A1Hyundai Motor Company
- Method for preparing a metal alloy8 Oct 2026US 2026/0308718 A1Constellium Muscle Shoals LLC
- Scrap submergence device and related processes1 Oct 2026US 2026/0298542 A1Novelis Inc.
- Method for recovering metals from waste battery using magnetic field applied biological leaching process10 Sep 2026US 2026/0265858 A1Ak Tree Co., Ltd.
Most cited
By later US patents
- Method and apparatus for circulating a molten media152US 3,984,234 AAluminum Company of America · 1976
- Metal scrap melting system150US 3,997,336 AAluminum Company of America · 1976
- Aluminum scrap reclamation148US 4,128,415 AAluminum Company of America · 1978
- Treatment of molten light metals and apparatus146US 4,931,091 AAlcan International Limited · 1990
- Gas injection method139US 4,052,199 AThe Carborundum Company · 1977