C22B 3/324
Naphthenic acids
Official title: {Naphthenic acids}
C22B3/324 (Naphthenic acids) appears on 9 US grants and 7 published applications in this corpus.
Search patents in C22B- Granted patents
- 9
- Published applications
- 7
- Assignees
- 9
- Inventors
- 28
- Latest grant
- 15 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 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 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 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 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 4 |
| 2023 | 0 | 1 |
| 2024 | 1 | 0 |
| 2025 | 3 | 2 |
By publication year. Applications have been published since 2001.
Recent patents
- Extraction system, extraction method for separating magnesium and extracting lithium from magnesium-containing brine with secondary amide-type solvent as well as applications thereof15 Jul 2025US 12,358,804 B2Xiangtan University
- Method for recovering valuable metal3 Jun 2025US 12,319,979 B2Jx Metals Circular Solutions Co., Ltd.
- Processing method of positive electrode active substance waste of lithium ion secondary battery4 Mar 2025US 12,243,993 B2Jx Metals Circular Solutions Co., Ltd.
- Method for recovering valuable metal10 Sep 2024US 12,084,742 B2Jx Metals Circular Solutions Co., Ltd.
- Recovery of neodymium/didymium values from bastnaesite ores16 Aug 1994US 5,338,520 ARhone-Poulenc Chimie
- Method for removing aluminum5 Jun 2025US 2025/0179612 A1Jx Metals Circular Solutions Co., Ltd.
- Method for manufacturing battery material6 Feb 2025US 2025/0046900 A1Prime Planet Energy & Solutions, Inc.
- Production method for cobalt sulfate15 Jun 2023US 2023/0183091 A1Sumitomo Metal Mining Co., Ltd.
- Extraction system, extraction method for separating magnesium and extracting lithium from magnesium-containing brine with secondary amide-type solvent as well as applications thereof5 May 2022US 2022/0135415 A1Xiangtan University
- Method for recovering valuable metal28 Apr 2022US 2022/0127697 A1JX Nippon Mining & Metals Corporation
Most cited
By later US patents
- Method for separating metal constituents from ocean floor nodules46US 4,042,664 ADeepsea Ventures, Inc. · 1977
- Cyclic process using A.C. for selective recovery of metals from materials containing same16US 4,039,404 AKennecott Copper Corporation · 1977
- Recovery of neodymium/didymium values from bastnaesite ores14US 5,338,520 ARhone-Poulenc Chimie · 1994
- Method for separating metal constituents from ocean floor nodules7US 3,950,486 ADeepsea Ventures, Inc. · 1976
- Separation of nickel and cobalt and manganese in solution2US 3,984,520 ADeepsea Ventures, Inc. · 1976