C22B 3/04
Extraction of metal compounds from ores or concentrates by wet processes: by
Official title: by leaching (C22B3/18 takes precedence)
C22B3/04 (Extraction of metal compounds from ores or concentrates by wet processes: by) appears on 1,513 US grants and 1,863 published applications in this corpus.
Search patents in C22B- Granted patents
- 1,513
- Published applications
- 1,863
- Assignees
- 1,134
- Inventors
- 4,217
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 27 | 0 |
| 1977 | 25 | 0 |
| 1978 | 23 | 0 |
| 1979 | 12 | 0 |
| 1980 | 18 | 0 |
| 1981 | 19 | 0 |
| 1982 | 16 | 0 |
| 1983 | 7 | 0 |
| 1984 | 9 | 0 |
| 1985 | 10 | 0 |
| 1986 | 16 | 0 |
| 1987 | 19 | 0 |
| 1988 | 12 | 0 |
| 1989 | 6 | 0 |
| 1990 | 18 | 0 |
| 1991 | 12 | 0 |
| 1992 | 14 | 0 |
| 1993 | 24 | 0 |
| 1994 | 20 | 0 |
| 1995 | 19 | 0 |
| 1996 | 21 | 0 |
| 1997 | 12 | 0 |
| 1998 | 16 | 0 |
| 1999 | 22 | 0 |
| 2000 | 12 | 0 |
| 2001 | 16 | 4 |
| 2002 | 29 | 21 |
| 2003 | 17 | 22 |
| 2004 | 17 | 31 |
| 2005 | 15 | 27 |
| 2006 | 9 | 26 |
| 2007 | 11 | 30 |
| 2008 | 9 | 35 |
| 2009 | 28 | 40 |
| 2010 | 37 | 57 |
| 2011 | 33 | 38 |
| 2012 | 35 | 39 |
| 2013 | 25 | 44 |
| 2014 | 29 | 49 |
| 2015 | 38 | 87 |
| 2016 | 45 | 86 |
| 2017 | 54 | 76 |
| 2018 | 65 | 67 |
| 2019 | 70 | 67 |
| 2020 | 74 | 81 |
| 2021 | 51 | 87 |
| 2022 | 55 | 104 |
| 2023 | 54 | 159 |
| 2024 | 94 | 198 |
| 2025 | 111 | 212 |
| 2026 | 83 | 176 |
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
- Integrated recovery of metals from complex substrates22 Sep 2026US 12,742,224 B2Yava International Inc.
- 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.
- Binder for an agglomeration process8 Sep 2026US 12,729,161 B2Mintek
- Lime and hydraulic cement manufacture by electrolysis using hyaloclastite or lava, carbon mineralization by hyaloclastite or lava electrolysis and method of making and using same8 Oct 2026US 2026/0308006 A1Greencraft LLC
- Process for the extraction of a by-product metal from a mineral concentrate8 Oct 2026US 2026/0308710 A1
- Method of recovery of scandium8 Oct 2026US 2026/0308716 A1Nippon Steel Corporation
- Acid impacts on a leach stockpile1 Oct 2026US 2026/0300850 A1Freeport Minerals Corporation
- Process for extracting nickel from gasifier slag24 Sep 2026US 2026/0285702 A1Reliance Industries Limited
Most cited
By later US patents
- Process for the reduction of metallic compounds by polyols, and metallic powders obtained by this process101US 4,539,041 AUniversite Paris VII · 1985
- Method for the removal of elemental mercury from a gas stream82US 5,900,042 AThe United States of America as represented by the United States Department of Energy · 1999
- Thin layer leaching method81US 4,017,309 AHolmes & Narver, Inc. · 1977
- Supercritical fluid extraction80US 5,356,538 AIdaho Research Foundation, Inc. · 1994
- Process for removal of silica from geothermal brine72US 4,016,075 ASouthern Pacific Land Co. · 1977