C22B 3/20
Treatment or purification of solutions
Official title: Treatment or purification of solutions, e.g. obtained by leaching (C22B3/18 takes precedence)
C22B3/20 (Treatment or purification of solutions) appears on 3,094 US grants and 2,808 published applications in this corpus.
Search patents in C22B- Granted patents
- 3,094
- Published applications
- 2,808
- Assignees
- 1,782
- Inventors
- 7,382
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 68 | 0 |
| 1977 | 63 | 0 |
| 1978 | 51 | 0 |
| 1979 | 49 | 0 |
| 1980 | 87 | 0 |
| 1981 | 88 | 0 |
| 1982 | 78 | 0 |
| 1983 | 82 | 0 |
| 1984 | 73 | 0 |
| 1985 | 71 | 0 |
| 1986 | 80 | 0 |
| 1987 | 50 | 0 |
| 1988 | 62 | 0 |
| 1989 | 51 | 0 |
| 1990 | 53 | 0 |
| 1991 | 46 | 0 |
| 1992 | 38 | 0 |
| 1993 | 48 | 0 |
| 1994 | 46 | 0 |
| 1995 | 33 | 0 |
| 1996 | 23 | 0 |
| 1997 | 35 | 0 |
| 1998 | 37 | 0 |
| 1999 | 42 | 0 |
| 2000 | 30 | 0 |
| 2001 | 50 | 16 |
| 2002 | 48 | 29 |
| 2003 | 29 | 42 |
| 2004 | 38 | 62 |
| 2005 | 26 | 48 |
| 2006 | 25 | 58 |
| 2007 | 38 | 57 |
| 2008 | 21 | 64 |
| 2009 | 49 | 65 |
| 2010 | 56 | 105 |
| 2011 | 51 | 85 |
| 2012 | 59 | 75 |
| 2013 | 73 | 78 |
| 2014 | 67 | 78 |
| 2015 | 66 | 102 |
| 2016 | 71 | 103 |
| 2017 | 56 | 88 |
| 2018 | 90 | 95 |
| 2019 | 96 | 106 |
| 2020 | 88 | 117 |
| 2021 | 77 | 125 |
| 2022 | 77 | 130 |
| 2023 | 73 | 241 |
| 2024 | 118 | 266 |
| 2025 | 149 | 321 |
| 2026 | 119 | 252 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Gas-Assisted Microflow Extraction (GAME) system patent6 Oct 2026US 12,753,463 B2Phinix, LLC
- Method for separating nickel from lithium, and application thereof22 Sep 2026US 12,742,225 B2Suzhou Botree Cycling Sci & Tech Co., Ltd
- Integration of carbon sequestration with selective hydrometallurgical recovery of metal values22 Sep 2026US 12,742,226 B2Negative Emissions Materials, 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 treating sulfide1 Sep 2026US 12,723,290 B2Sumitomo Metal Mining Co., Ltd.
- Oxime-based adsorbents and methods of use for selective separation of rare earth elements8 Oct 2026US 2026/0307049 A1The Board of Regents of the University of Oklahoma
- Synthesis of bio-based catecholic acid- and derivatives-functionalized adsorbents for recovery of metals and metalloids from acidic solutions8 Oct 2026US 2026/0307051 A1The Penn State Research Foundation
- Process for the extraction of a by-product metal from a mineral concentrate8 Oct 2026US 2026/0308710 A1
- Systems and methods for improved metal recovery by leaching8 Oct 2026US 2026/0308711 A1Freeport Minerals Corporation
- Systems and methods for improved metal recovery by leaching8 Oct 2026US 2026/0308712 A1Freeport Minerals Corporation
Most cited
By later US patents
- Surface-functionalized mesoporous carbon materials255US 9,249,241 B2UT-Battelle, LLC · 2016
- Adsorbent compositions173US 4,474,896 AUnion Carbide Corporation · 1984
- Process for the purification of lithium carbonate95US 6,048,507 ALimtech · 2000
- Recovery of lithium from brine85US 4,291,001 AThe Dow Chemical Company · 1981
- Supercritical fluid extraction80US 5,356,538 AIdaho Research Foundation, Inc. · 1994