C22B 4/04
Heavy metals
Official title: Heavy metals {(C22B4/005 takes precedence)}
C22B4/04 (Heavy metals) appears on 36 US grants and 45 published applications in this corpus.
Search patents in C22B- Granted patents
- 36
- Published applications
- 45
- Assignees
- 41
- Inventors
- 134
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 2 |
| 2005 | 1 | 1 |
| 2006 | 1 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 1 | 4 |
| 2010 | 1 | 1 |
| 2011 | 2 | 0 |
| 2012 | 2 | 0 |
| 2013 | 0 | 3 |
| 2014 | 1 | 2 |
| 2015 | 0 | 5 |
| 2016 | 3 | 1 |
| 2017 | 1 | 1 |
| 2018 | 2 | 2 |
| 2019 | 1 | 0 |
| 2020 | 2 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 0 |
| 2023 | 0 | 5 |
| 2024 | 3 | 2 |
| 2025 | 0 | 6 |
| 2026 | 4 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Ultrafast flash joule heating synthesis methods and systems for performing same11 Aug 2026US 12,703,891 B2William Marsh Rice University
- Rare earth laser-assisted metal production and separation12 May 2026US 12,624,416 B2Iowa State University Research Foundation, Inc.
- Method for producing reduced form of metal oxides14 Apr 2026US 12,601,030 B2K.K. Sun Metalon
- Systems and methods for recovery of molten metal3 Feb 2026US 12,540,413 B2Phoenix Tailings, Inc.
- System and method for solubilising in an aqueous medium elements contained in a sulfide ore concentrate24 Sep 2024US 12,098,443 B2Platinum Group Chile SPA
- Method for extracting nickel-cobalt-manganese from laterite nickel ore by acid leaching27 Aug 2026US 2026/0250801 A1Gem Co., Ltd.
- Method for producing reduced form of metal oxide23 Jul 2026US 2026/0209886 A1K.K. Sun Metalon
- Systems and methods for recovery of molten metal7 May 2026US 2026/0125814 A1Phoenix Tailings, Inc.
- Method for leaching of rare earth elements in fluorescent lamp waste16 Apr 2026US 2026/0103777 A1Yildiz Teknik üNiversitesi DöNer Sermaye Isletme MüD
- Apparatus and methods for rare earth element recovery and purification12 Mar 2026US 2026/0071299 A1
Most cited
By later US patents
- Process for plasma synthesis of rhenium nano and micro powders, and for coatings and near net shape deposits thereof and apparatus therefor73US 7,494,527 B2Tekna Plasma Systems Inc. · 2009
- Refining of tantalum and tantalum scrap with carbon23US 6,197,082 B1H. C. Starck GmbH · 2001
- Process for recovering valuable metals from spent catalysts12US 5,013,533 A1991
- Method for recovering zinc from zinc-containing waste materials10US 5,188,658 AElkem Technology a/s · 1993
- Lead smelting method7US 4,353,738 ALectromelt Corporation · 1982