C22B 3/322
Oxalic acids
Official title: {Oxalic acids}
C22B3/322 (Oxalic acids) appears on 24 US grants and 6 published applications in this corpus.
Search patents in C22B- Granted patents
- 24
- Published applications
- 6
- Assignees
- 26
- Inventors
- 67
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 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 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 1 |
| 2020 | 0 | 1 |
| 2021 | 0 | 1 |
| 2022 | 2 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 2 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for recovering hafnium and impurity metals from hafnium-containing waste residue14 Jul 2026US 12,680,145 B2Jiangxi Zhongha New Material Co., Ltd.
- Carbamides for separating uranium(VI) and plutonium(IV) without reducing the plutonium(IV)25 Oct 2022US 11,479,833 B2Commissariat A L'energie Atomique Et Aux Energies
- Extractant for rare earth extraction from aqueous phosphoric acid solutions and method of extraction11 Oct 2022US 11,466,341 B2Centre National De La Recherche Scientifique
- Method for preparation of high purity, crystalline cobalt nitrate from spent cobalt/silica catalyst24 Mar 2015US 8,986,644 B2Wuhan Kaidi Engineering Technology Research Institute Co., Ltd.
- Recovery of scandium, yttrium and lanthanides from zircon sand13 Aug 1991US 5,039,336 AWestinghouse Electric Corp.
- Methods and compositions to recover rare earth elements from organic solutions4 Dec 2025US 2025/0369073 A1West Virginia University Board of Governors on behalf of West Virginia University
- Method for recovering hafnium and impurity metals from hafnium-containing waste residue13 Mar 2025US 2025/0084504 A1Shenzhen Sinohf Technology Co., Ltd.
- Carbamides for separating uranium(vi) and plutonium(iv) without reducing the plutonium(iv)25 Nov 2021US 2021/0363609 A1Commissariat A L'energie Atomique Et Aux Energies
- Process for leaching rare earth elements19 Nov 2020US 2020/0362436 A1
- New extractant, useful for extracting rare earths from an aqueous phosphoric acid solution, and the applications thereof18 Jul 2019US 2019/0218643 A1Centre National De La Recherche Scientifique
Most cited
By later US patents
- Treatment of copper refinery slimes30US 4,094,668 ANewmont Exploration Limited · 1978
- Refining of noble group metals27US 3,979,207 AMatthey Rustenburg Refiners (Proprietary) Limited · 1976
- Extraction method for non-ferrous metals23US 3,958,985 AChemsep Corporation · 1976
- Method for the recovery of actinide elements from nuclear reactor waste22US 4,162,230 AThe United States of America as represented by the United States Department of Energy · 1979
- Recovery of scandium, yttrium and lanthanides from zircon sand22US 5,039,336 AWestinghouse Electric Corp. · 1991