C02F 2001/425
Using cation exchangers
Official title: {using cation exchangers}
C02F2001/425 (Using cation exchangers) appears on 505 US grants and 766 published applications in this corpus.
Search patents in C02F- Granted patents
- 505
- Published applications
- 766
- Assignees
- 393
- Inventors
- 1,590
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 3 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 2 |
| 2002 | 4 | 14 |
| 2003 | 11 | 11 |
| 2004 | 7 | 22 |
| 2005 | 8 | 17 |
| 2006 | 11 | 22 |
| 2007 | 19 | 20 |
| 2008 | 8 | 33 |
| 2009 | 7 | 18 |
| 2010 | 16 | 27 |
| 2011 | 5 | 23 |
| 2012 | 14 | 24 |
| 2013 | 19 | 36 |
| 2014 | 20 | 43 |
| 2015 | 27 | 42 |
| 2016 | 17 | 34 |
| 2017 | 23 | 37 |
| 2018 | 31 | 35 |
| 2019 | 38 | 49 |
| 2020 | 39 | 45 |
| 2021 | 44 | 44 |
| 2022 | 24 | 28 |
| 2023 | 27 | 29 |
| 2024 | 22 | 37 |
| 2025 | 21 | 47 |
| 2026 | 10 | 27 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Water softening structure and regeneration method therefor10 Sep 2026US 2026/0265086 A1Canature Health Technology Group Co., Ltd.
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Most cited
By later US patents
- Medicament preparation and treatment devices, methods, and systems259US 10,478,544 B2NxStage Medical, Inc. · 2019
- 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
- Methods of improving oil or gas production with recycled, increased sodium water84US 7,717,173 B2Ecycling, LLC · 2010