C22B 3/44
By chemical processes
Official title: by chemical processes (treatment or purification of solutions by liquid-liquid extraction C22B3/26, by ion-exchange extraction C22B3/42)
C22B3/44 (By chemical processes) appears on 843 US grants and 1,174 published applications in this corpus.
Search patents in C22B- Granted patents
- 843
- Published applications
- 1,174
- Assignees
- 732
- Inventors
- 2,748
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 9 | 0 |
| 1978 | 8 | 0 |
| 1979 | 8 | 0 |
| 1980 | 12 | 0 |
| 1981 | 11 | 0 |
| 1982 | 10 | 0 |
| 1983 | 9 | 0 |
| 1984 | 5 | 0 |
| 1985 | 3 | 0 |
| 1986 | 7 | 0 |
| 1987 | 13 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 1 | 0 |
| 1993 | 4 | 0 |
| 1994 | 7 | 0 |
| 1995 | 10 | 0 |
| 1996 | 9 | 0 |
| 1997 | 9 | 0 |
| 1998 | 9 | 0 |
| 1999 | 12 | 0 |
| 2000 | 5 | 0 |
| 2001 | 13 | 5 |
| 2002 | 19 | 9 |
| 2003 | 9 | 16 |
| 2004 | 11 | 20 |
| 2005 | 8 | 17 |
| 2006 | 9 | 23 |
| 2007 | 13 | 19 |
| 2008 | 6 | 24 |
| 2009 | 21 | 24 |
| 2010 | 19 | 39 |
| 2011 | 23 | 27 |
| 2012 | 18 | 21 |
| 2013 | 20 | 27 |
| 2014 | 23 | 26 |
| 2015 | 19 | 43 |
| 2016 | 31 | 54 |
| 2017 | 26 | 38 |
| 2018 | 45 | 44 |
| 2019 | 41 | 43 |
| 2020 | 35 | 40 |
| 2021 | 32 | 47 |
| 2022 | 27 | 51 |
| 2023 | 30 | 105 |
| 2024 | 50 | 130 |
| 2025 | 58 | 158 |
| 2026 | 55 | 124 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for treating sulfide1 Sep 2026US 12,723,290 B2Sumitomo Metal Mining Co., Ltd.
- Methods for battery-grade aqueous solutions of nickel salts18 Aug 2026US 12,709,552 B2Bluegrass Infrastructure Partners Holdings, LLC
- Compositions and systems for selective lithium leaching and related methods18 Aug 2026US 12,709,785 B2American Battery Technology Company
- Selective recovery of Li18 Aug 2026US 12,709,786 B2Gelion Technologies Pty Ltd
- Process with low environmental impact and reduced energy consumption for the recovery of lead from the electrode pastes of end-of-life batteries21 Jul 2026US 12,689,074 B2Metallon Clean Extractions B.V.
- 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
- Method of recovery of scandium8 Oct 2026US 2026/0308716 A1Nippon Steel Corporation
- Mining chemical collector compositions and processes for recovering metal from ore1 Oct 2026US 2026/0295598 A1Chevron Phillips Chemical Company LP
- Method for refining nickel sulfate at normal pressure and nickel extractant used therein1 Oct 2026US 2026/0296915 A1Walsin Lihwa Corporation
Most cited
By later US patents
- Process and apparatus for oxidizing or reducing dissolved substance64US 4,774,026 AHitachi, Ltd. · 1988
- Process for the recovery of hydrogen-reduced metals, ions and the like at porous hydrophobic catalytic barriers51US 4,331,520 APrototech Company · 1982
- Recovery of lithium compounds from brines45US 6,207,126 B1Chemetall Foote Corporation · 2001
- Methods for removing heavy metals from water using chemical precipitation and field separation methods45US 7,255,793 B22007
- Simultaneous leaching and cementation of precious metals40US 4,384,889 AFreeport Research & Development Company · 1983