C01F 7/74
Sulfates
C01F7/74 (Sulfates) appears on 101 US grants and 56 published applications in this corpus.
Search patents in C01F- Granted patents
- 101
- Published applications
- 56
- Assignees
- 90
- Inventors
- 265
- Latest grant
- 28 Jan 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 7 | 0 |
| 1982 | 5 | 0 |
| 1983 | 3 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 3 | 0 |
| 1999 | 6 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 2 |
| 2004 | 0 | 7 |
| 2005 | 1 | 1 |
| 2006 | 2 | 0 |
| 2007 | 2 | 1 |
| 2008 | 1 | 1 |
| 2009 | 0 | 2 |
| 2010 | 1 | 1 |
| 2011 | 0 | 1 |
| 2012 | 1 | 0 |
| 2013 | 1 | 1 |
| 2014 | 0 | 2 |
| 2015 | 0 | 2 |
| 2016 | 2 | 2 |
| 2017 | 1 | 6 |
| 2018 | 5 | 3 |
| 2019 | 5 | 5 |
| 2020 | 6 | 4 |
| 2021 | 4 | 0 |
| 2022 | 0 | 4 |
| 2023 | 3 | 4 |
| 2024 | 2 | 2 |
| 2025 | 1 | 2 |
| 2026 | 0 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C01F 7/76Double salts, i.e. compounds containing, besides aluminium and sulfate ions, only other39
- C01F 7/746After-treatment16
- C01F 7/743Preparation from silicoaluminious materials10
- C01F 7/741Preparation from elemental aluminium or elemental aluminium containing materials7
- C01F 7/745Preparation from alums0
Recent patents
- Negative electrode active material and lithium secondary battery comprising the same28 Jan 2025US 12,211,995 B2LG Energy Solution, Ltd.
- Methods of extraction of products from titanium-bearing materials24 Dec 2024US 12,172,905 B2Avertana Limited
- Recovery of lithium hydroxide9 Jul 2024US 12,030,784 B2Bright Minz Pty Ltd
- Selective recovery method of vanadium and cesium from waste sulfuric acid vanadium catalyst, and high-quality vanadium aqueous solution and cesium alum produced thereby7 Nov 2023US 11,807,544 B2Korea Institute of Geoscience and Mineral Resources
- High purity aluminum oxide via electrodialysis5 Sep 2023US 11,746,021 B2Nextchem S.P.A.
- A method for the preparation of alumina13 Aug 2026US 2026/0234017 A1Playa One Pty Ltd
- System for preparing aluminum compounds using waste sulfuric acid and method thereof28 May 2026US 2026/0145958 A1Mg Chem Co., Ltd.
- Method of processing alum process residue5 Mar 2026US 2026/0062306 A1Chemtrade Chemicals US LLC
- Extraction process for reducing the alunite content from tailings, product, and its use21 Aug 2025US 2025/0263305 A1Vale S.A.
- Method for recovering lithium from waste lithium ion batteries3 Jul 2025US 2025/0219177 A1Asaka Riken Co., Ltd.
Most cited
By later US patents
- Hydrotalcites having a hexagonal needle-like crystal structure and process for production thereof46US 4,351,814 AKyowa Chemical Industry Co., Ltd. · 1982
- Recovery of metal values from spent catalysts30US 4,721,606 AUnion Oil Company of California · 1988
- Method of removing iron from concentrated alum solutions28US 5,093,091 AAmerican Cyanamid Company · 1992
- Recovery of aluminum and other metal values from fly ash24US 4,252,777 AThe United States of America as represented by the United States Department of Energy · 1981
- Inorganic anion exchangers and preparation thereof23US 4,661,282 AThe Dow Chemical Company · 1987