C22B 3/28
Amines
C22B3/28 (Amines) appears on 187 US grants and 80 published applications in this corpus.
Search patents in C22B- Granted patents
- 187
- Published applications
- 80
- Assignees
- 134
- Inventors
- 382
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 11 | 0 |
| 1978 | 4 | 0 |
| 1979 | 5 | 0 |
| 1980 | 9 | 0 |
| 1981 | 12 | 0 |
| 1982 | 14 | 0 |
| 1983 | 7 | 0 |
| 1984 | 13 | 0 |
| 1985 | 9 | 0 |
| 1986 | 6 | 0 |
| 1987 | 3 | 0 |
| 1988 | 4 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 3 |
| 2004 | 2 | 6 |
| 2005 | 3 | 2 |
| 2006 | 1 | 3 |
| 2007 | 5 | 2 |
| 2008 | 1 | 1 |
| 2009 | 2 | 0 |
| 2010 | 1 | 3 |
| 2011 | 1 | 3 |
| 2012 | 1 | 0 |
| 2013 | 2 | 2 |
| 2014 | 2 | 3 |
| 2015 | 1 | 3 |
| 2016 | 3 | 1 |
| 2017 | 2 | 8 |
| 2018 | 3 | 4 |
| 2019 | 2 | 6 |
| 2020 | 7 | 4 |
| 2021 | 3 | 3 |
| 2022 | 5 | 7 |
| 2023 | 3 | 3 |
| 2024 | 1 | 2 |
| 2025 | 2 | 6 |
| 2026 | 3 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Methods for separation and recovery of rare earth elements from aqueous solutions using diglycolamide derivatives30 Jun 2026US 12,668,857 B2Battelle Energy Alliance, LLC
- Process for removing cyanide from a cyanide-bearing aqueous fluid21 Apr 2026US 12,606,462 B2Commonwealth Scientific and Industrial Research Organisation
- Separation of rare earth elements24 Mar 2026US 12,584,193 B2SHINE Technologies, LLC
- Methods for the purification of molybdenum-99 with phase transfer agents14 Oct 2025US 12,441,626 B2Abilene Christian University
- Diglycolamide derivatives for separation and recovery of rare earth elements from aqueous solutions26 Aug 2025US 12,398,444 B2UT-Battelle, LLC
- Selective extraction of rhodium from hydrochloric acid solutions comprising rhodium and iridium10 Sep 2026US 2026/0265861 A1Johnson Matthey Public Limited Company
- Separation of rare earth elements25 Jun 2026US 2026/0176719 A1SHINE Technologies, LLC
- Use of lipophilic derivatives of aminopolycarboxylic acids for the extraction of rare earths from an acidic aqueous solution14 May 2026US 2026/0132482 A1Centre National De La Recherche Scientifique
- Process for selectively capturing chemical elements from a polymetallic sample26 Feb 2026US 2026/0055006 A1Centre National De La Recherche Scientifique
- Separation of rare earth elements2 Oct 2025US 2025/0305091 A1SHINE Technologies, LLC
Most cited
By later US patents
- Method for separating metal constituents from ocean floor nodules46US 4,042,664 ADeepsea Ventures, Inc. · 1977
- Process for producing electrolytic manganese dioxide from geothermal brines38US 6,682,644 B2MidAmerican Energy Holdings Company · 2004
- Method of purifying tantalum35US 4,673,554 ASumitomo Chemical Company, Limited · 1987
- Method of extracting zinc from brines34US 5,246,684 ACyprus Power Company · 1993
- Process for the recovery of precious metal values from aqueous ammoniacal thiosulfate leach solutions34US 5,939,034 AHenkel Corporation · 1999