C22B 3/1666
Leaching with heterocyclic compounds
Official title: {Leaching with heterocyclic compounds}
C22B3/1666 (Leaching with heterocyclic compounds) appears on 22 US grants and 27 published applications in this corpus.
Search patents in C22B- Granted patents
- 22
- Published applications
- 27
- Assignees
- 28
- Inventors
- 67
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 1 | 1 |
| 2013 | 1 | 1 |
| 2014 | 0 | 2 |
| 2015 | 0 | 1 |
| 2016 | 2 | 1 |
| 2017 | 1 | 2 |
| 2018 | 0 | 4 |
| 2019 | 0 | 2 |
| 2020 | 4 | 1 |
| 2021 | 1 | 1 |
| 2022 | 3 | 3 |
| 2023 | 1 | 1 |
| 2024 | 1 | 3 |
| 2025 | 0 | 2 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Methods for selective recovery of rare earth elements and metals from coal ash by ionic liquids24 Mar 2026US 12,584,190 B2Georgia Tech Research Corporation
- Agent for selective metal recovery, metal recovery method, and metal elution method17 Mar 2026US 12,577,633 B2Galdieria Co., Ltd.
- Compounds for the selective solid-liquid extraction and liquid-liquid extraction of lithium chloride3 Sep 2024US 12,077,520 B2Board of Regents, The University of Texas System
- Methods for simultaneous leaching and extraction of precious metals14 Nov 2023US 11,814,698 B2Excir Works Corp.
- Molecularly imprinted polymer beads for extraction of metals and uses thereof4 Oct 2022US 11,458,453 B26th Wave Innovations Corp.
- Agent for selective metal recovery, metal recovery method, and metal elution method16 Apr 2026US 2026/0103773 A1Galdieria Co., Ltd.
- Process for the recovery of platinum from spent platinum-containing solid residues18 Sep 2025US 2025/0290174 A1Fundacion Tecnalia Research & Innovation
- Recycling methods for lithium-ion batteries9 Jan 2025US 2025/0015378 A1The Regents of the University of California
- A green process for the extraction of lanthanide elements19 Dec 2024US 2024/0417826 A1Centre National De La Recherche Scientifique
- Method of selective precipitation of metals using amide compounds7 Nov 2024US 2024/0368727 A1The University Court of the University of Edinburgh
Most cited
By later US patents
- Enhancement of gold lixiviation using nitrogen and sulfur heterocyclic aromatic compounds23US 5,484,470 AE. I. Du Pont de Nemours and Company · 1996
- Process for metal recovery and compositions useful therein21US 4,637,865 AGreat Lakes Chemical Corporation · 1987
- Extraction and recovery of gold12US 5,260,040 ACRA Services Limited · 1993
- Molecularly imprinted polymer beads for extraction of metals and uses thereof5US 9,504,988 B16th Wave Innovations Corp. · 2016
- Process for recovering precious metals from clay-containing ores4US 11,111,559 B2Ethox Chemicals, LLC · 2021