C02F 2001/422
Using anionic exchangers
Official title: {using anionic exchangers}
C02F2001/422 (Using anionic exchangers) appears on 332 US grants and 528 published applications in this corpus.
Search patents in C02F- Granted patents
- 332
- Published applications
- 528
- Assignees
- 288
- Inventors
- 1,141
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 2 |
| 2002 | 2 | 15 |
| 2003 | 9 | 9 |
| 2004 | 5 | 20 |
| 2005 | 8 | 17 |
| 2006 | 7 | 18 |
| 2007 | 12 | 12 |
| 2008 | 4 | 16 |
| 2009 | 6 | 13 |
| 2010 | 13 | 16 |
| 2011 | 1 | 20 |
| 2012 | 12 | 12 |
| 2013 | 7 | 16 |
| 2014 | 17 | 20 |
| 2015 | 20 | 30 |
| 2016 | 7 | 25 |
| 2017 | 15 | 18 |
| 2018 | 15 | 29 |
| 2019 | 20 | 28 |
| 2020 | 25 | 47 |
| 2021 | 25 | 22 |
| 2022 | 19 | 25 |
| 2023 | 18 | 26 |
| 2024 | 15 | 24 |
| 2025 | 14 | 25 |
| 2026 | 9 | 23 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Water treatment apparatus and water treatment method6 Oct 2026US 12,753,097 B2Organo Corporation
- Formulations and processes for treating water from impacted sources25 Aug 2026US 12,714,991 B2Brown University
- Ultrapure water production system14 Jul 2026US 12,679,749 B2Organo Corporation
- Ultrapure water production system, semiconductor processing system including the same, and semiconductor fabrication method using the same23 Jun 2026US 12,662,405 B2Samsung Electronics Co., Ltd.
- Process for removing cyanide from a cyanide-bearing aqueous fluid21 Apr 2026US 12,606,462 B2Commonwealth Scientific and Industrial Research Organisation
- Water treatment system, pure water production method, and water treatment method1 Oct 2026US 2026/0296933 A1Organo Corporation
- Water treatment device and water treatment method24 Sep 2026US 2026/0285718 A1Organo Corporation
- Hybrid electrodialysis and electrolysis systems and processes24 Sep 2026US 2026/0285728 A1Pani Clean, Inc.
- Water treatment apparatus3 Sep 2026US 2026/0257940 A1LG Electronics Inc.
- Water purification system20 Aug 2026US 2026/0242267 A1ZRO Waste Water, Inc.
Most cited
By later US patents
- Method and apparatus for high efficiency reverse osmosis operation122US 5,925,255 A1999
- Method and apparatus for high efficiency reverse osmosis operation101US 6,537,456 B22003
- Method and system for purifying liquid88US 3,985,648 AAlmag Pollution Control Corporation · 1976
- Electrodeionization apparatus and method80US 6,649,037 B2United States Filter Corporation · 2003
- Combined membrane and sorption process for selective ion removal79US 4,806,244 AThe Dow Chemical Company · 1989