C22B 3/304
Crown ethers
Official title: {Crown ethers}
C22B3/304 (Crown ethers) appears on 26 US grants and 17 published applications in this corpus.
Search patents in C22B- Granted patents
- 26
- Published applications
- 17
- Assignees
- 24
- Inventors
- 82
- Latest grant
- 8 Mar 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 2 |
| 2003 | 3 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 1 | 0 |
| 2007 | 1 | 1 |
| 2008 | 1 | 2 |
| 2009 | 1 | 0 |
| 2010 | 0 | 1 |
| 2011 | 1 | 0 |
| 2012 | 1 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
| 2021 | 0 | 0 |
| 2022 | 1 | 0 |
| 2023 | 0 | 1 |
| 2024 | 0 | 1 |
| 2025 | 0 | 2 |
| 2026 | 0 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Fluorinated crown ethers and methods and systems for extraction of lithium using same8 Mar 2022US 11,266,926 B2Cornell University
- Method for the purification of radium from different sources6 May 2014US 8,715,598 B2Actinium Pharmaceuticals, Inc.
- Method for the purification of radium from different sources10 Apr 2012US 8,153,087 B2Actinium Pharmaceuticals, Inc.
- Rare-earth amidate coordination compounds6 Sep 2011US 8,012,458 B2E. I. Du Pont de Nemours and Company
- Extractant composition including crown ether and calixarene extractants28 Apr 2009US 7,524,469 B2Battelle Energy Alliance, LLC
- Method and composition for liquid-liquid extraction17 Sep 2026US 2026/0275450 A1Molten Salt Solutions, LLC
- Liquid-liquid extraction system for electroactive metal electrodeposition from brine20 Aug 2026US 2026/0242970 A1Pure Lithium Corporation
- Targeted extraction of rare earth elements, yttrium and radium from mineralogically characterized phosphogypsum26 Feb 2026US 2026/0055485 A1The Florida State University Research Foundation, Inc.
- Crown ether liquid-liquid extraction system for the electrodeposition of lithium metal from brine28 Aug 2025US 2025/0270725 A1Pure Lithium Corporation
- Method and composition for liquid-liquid extraction1 May 2025US 2025/0135403 A1
Most cited
By later US patents
- Supercritical fluid extraction80US 5,356,538 AIdaho Research Foundation, Inc. · 1994
- Methods and devices for the separation of radioactive rare earth metal isotopes from their alkaline earth metal precursors59US 5,225,173 AIdaho Research Foundation, Inc. · 1993
- Hydroxamic acid crown ethers58US 5,274,129 AIdaho Research Foundation, Inc. · 1993
- Liquid/liquid extraction/purification of impure solutions of rare earth values31US 4,726,938 ARhone-Poulenc Specialites Chimiques · 1988
- Bis-crown calix [4]arenes, their preparation process and their use for the selective extraction of cesium and actinides23US 5,607,591 ACommissariat A L' Energie Atomique · 1997