C01F 7/46
Purification of aluminium oxide, aluminium hydroxide or aluminates
Official title: Purification of aluminium oxide, aluminium hydroxide or aluminates (C01F7/028 takes precedence)
C01F7/46 (Purification of aluminium oxide, aluminium hydroxide or aluminates) appears on 208 US grants and 112 published applications in this corpus.
Search patents in C01F- Granted patents
- 208
- Published applications
- 112
- Assignees
- 118
- Inventors
- 473
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 7 | 0 |
| 1978 | 5 | 0 |
| 1979 | 1 | 0 |
| 1980 | 4 | 0 |
| 1981 | 6 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 8 | 0 |
| 1985 | 8 | 0 |
| 1986 | 10 | 0 |
| 1987 | 12 | 0 |
| 1988 | 6 | 0 |
| 1989 | 8 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 6 | 0 |
| 1993 | 1 | 0 |
| 1994 | 4 | 0 |
| 1995 | 4 | 0 |
| 1996 | 3 | 0 |
| 1997 | 4 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 4 | 0 |
| 2001 | 2 | 1 |
| 2002 | 3 | 0 |
| 2003 | 3 | 4 |
| 2004 | 4 | 9 |
| 2005 | 1 | 4 |
| 2006 | 3 | 3 |
| 2007 | 5 | 6 |
| 2008 | 1 | 2 |
| 2009 | 2 | 3 |
| 2010 | 4 | 3 |
| 2011 | 5 | 6 |
| 2012 | 4 | 5 |
| 2013 | 4 | 9 |
| 2014 | 3 | 3 |
| 2015 | 5 | 2 |
| 2016 | 3 | 5 |
| 2017 | 1 | 6 |
| 2018 | 5 | 5 |
| 2019 | 5 | 4 |
| 2020 | 4 | 4 |
| 2021 | 2 | 5 |
| 2022 | 2 | 11 |
| 2023 | 3 | 3 |
| 2024 | 3 | 5 |
| 2025 | 6 | 1 |
| 2026 | 4 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Process for the preparation of high surface area alpha alumina and the use thereof12 May 2026US 12,623,207 B2Studiengesellschaft Kohle mbH
- Use of a hydraulic binder containing calcium aluminate for the production of a construction material12 May 2026US 12,623,963 B2ARDEX Group GmbH
- Treated geothermal brine compositions with reduced concentration of silica, iron and lithium3 Feb 2026US 12,540,267 B2Terralithium LLC
- Acid wash of red mud (bauxite residue)20 Jan 2026US 12,528,709 B2Worcester Polytechnic Institute
- Waste battery treatment method28 Oct 2025US 12,456,767 B2LG Energy Solution, Ltd.
- High-purity alumina particles and method of producing same, and resin composition for electronic devices and method of producing the same10 Sep 2026US 2026/0265496 A1Admatechs Co., Ltd.
- Spray calcination and drying process to produce high-purity alumina2 Jul 2026US 2026/0184584 A1
- Zero waste closed-loop green lithium-ion battery recycling25 Jun 2026US 2026/0176717 A1American Advanced Membrane Technology LLC
- Composition comprising lithium-containing compound, and battery disposal method10 Jul 2025US 2025/0223183 A1Posco
- Bayer Process22 Aug 2024US 2024/0279075 A1Rio Tinto AIcan International Limited
Most cited
By later US patents
- Polymers containing hydroxamic acid groups for reduction of suspended solids in bayer process streams62US 4,767,540 AAmerican Cyanamid Company · 1988
- Method for making high purity and free flowing metal oxides powder47US 7,931,836 B2Sulzer Metco (US), Inc. · 2011
- Hydrotalcites having a hexagonal needle-like crystal structure and process for production thereof46US 4,351,814 AKyowa Chemical Industry Co., Ltd. · 1982
- Recovery of alumina from bauxite43US 5,008,089 AAllied Colloids Limited · 1991
- Process for liquid/liquid extraction of gallium31US 3,971,843 ARhone-Poulenc Industries · 1976