C01D 1/28
Purification
Official title: Purification; Separation
C01D1/28 (Purification) appears on 101 US grants and 70 published applications in this corpus.
Search patents in C01D- Granted patents
- 101
- Published applications
- 70
- Assignees
- 89
- Inventors
- 260
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 6 | 0 |
| 1982 | 3 | 0 |
| 1983 | 4 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 4 | 0 |
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 5 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 5 | 0 |
| 2001 | 6 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 1 | 1 |
| 2010 | 0 | 7 |
| 2011 | 3 | 1 |
| 2012 | 4 | 2 |
| 2013 | 1 | 1 |
| 2014 | 1 | 1 |
| 2015 | 2 | 3 |
| 2016 | 1 | 4 |
| 2017 | 2 | 2 |
| 2018 | 3 | 1 |
| 2019 | 3 | 3 |
| 2020 | 1 | 3 |
| 2021 | 3 | 4 |
| 2022 | 1 | 3 |
| 2023 | 3 | 5 |
| 2024 | 1 | 10 |
| 2025 | 4 | 11 |
| 2026 | 2 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Process for recovering and purifying lithium11 Aug 2026US 12,703,896 B2Fortum Battery Recycling Oy
- Processes for preparing hydroxides and oxides of various metals and derivatives thereof21 Apr 2026US 12,606,456 B2Nemaska Lithium Inc.
- Method and system for preparing battery grade and high purity grade lithium hydroxide and lithium carbonate from high-impurity lithium sources11 Nov 2025US 12,466,739 B2Coli Tech Pte. Ltd.
- Layered double hydroxide electride and method for producing same29 Jul 2025US 12,371,336 B2Japan Science and Technology Agency
- Process to recover alkali from a metal oxide/hydroxide containing material22 Jul 2025US 12,365,962 B2FPInnovations
- High-efficiency method for producing lithium hydroxide from lithium carbonate through process improvement1 Oct 2026US 2026/0296907 A1Korea Institute of Geoscience and Mineral Resources
- Method for manufacturing lithium hydroxide20 Aug 2026US 2026/0242229 A1Idemitsu Kosan Co., Ltd.
- Processes for preparing hydroxides and oxides of various metals and derivatives thereof13 Aug 2026US 2026/0234024 A1Nemaska Lithium Inc.
- Method for manufacturing lithium hydroxide6 Aug 2026US 2026/0225905 A1Kemco
- Lithium recovery through reversible fatty acid precipitation11 Jun 2026US 2026/0159404 A1Uchicago Argonne, LLC
Most cited
By later US patents
- Apparatus and process for electrodialysis of salts67US 6,221,225 B1Archer Daniels Midland Company · 2001
- Low energy 4-cell electrochemical system with carbon dioxide gas67US 7,875,163 B2Calera Corporation · 2011
- Electrodialytic process for producing an alkali solution41US 5,282,935 AOlin Corporation · 1994
- CO2 utilization in electrochemical systems36US 8,357,270 B2Calera Corporation · 2013
- Method for producing high purity hydroxides and alkoxides33US 5,389,211 ASachem, Inc. · 1995