C02F 1/22
Treatment of water, waste water, or sewage: by freezing
Official title: by freezing
C02F1/22 (Treatment of water, waste water, or sewage: by freezing) appears on 263 US grants and 213 published applications in this corpus.
Search patents in C02F- Granted patents
- 263
- Published applications
- 213
- Assignees
- 163
- Inventors
- 568
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 4 | 0 |
| 1982 | 7 | 0 |
| 1983 | 7 | 0 |
| 1984 | 5 | 0 |
| 1985 | 7 | 0 |
| 1986 | 3 | 0 |
| 1987 | 4 | 0 |
| 1988 | 4 | 0 |
| 1989 | 5 | 0 |
| 1990 | 3 | 0 |
| 1991 | 10 | 0 |
| 1992 | 8 | 0 |
| 1993 | 5 | 0 |
| 1994 | 1 | 0 |
| 1995 | 5 | 0 |
| 1996 | 6 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 4 | 0 |
| 2000 | 4 | 0 |
| 2001 | 2 | 0 |
| 2002 | 6 | 4 |
| 2003 | 5 | 4 |
| 2004 | 5 | 2 |
| 2005 | 3 | 8 |
| 2006 | 6 | 4 |
| 2007 | 3 | 7 |
| 2008 | 4 | 6 |
| 2009 | 11 | 14 |
| 2010 | 4 | 10 |
| 2011 | 5 | 2 |
| 2012 | 2 | 11 |
| 2013 | 3 | 2 |
| 2014 | 11 | 10 |
| 2015 | 7 | 12 |
| 2016 | 8 | 2 |
| 2017 | 5 | 12 |
| 2018 | 5 | 12 |
| 2019 | 6 | 12 |
| 2020 | 7 | 7 |
| 2021 | 4 | 7 |
| 2022 | 6 | 14 |
| 2023 | 6 | 19 |
| 2024 | 18 | 12 |
| 2025 | 6 | 11 |
| 2026 | 7 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Separating ions in water using plastic ice VII29 Sep 2026US 12,747,165 B2International Business Machines Corporation
- Freeze concentration for urine-based fertilizer production29 Sep 2026US 12,747,194 B2The Regents of the University of Michigan
- Electro-activated super oxidized water and method of synthesizing the same16 Jun 2026US 12,655,044 B2Bactiguard AB
- System and method of distilling/desalinating water in a vacuum-applied centrifugal multi-phase manner12 May 2026US 12,623,923 B2
- Continuous production of clathrate hydrates from aqueous and hydrate-forming streams, methods and uses thereof24 Feb 2026US 12,559,375 B2Petrogal, S.A.
- Process for producing battery-grade lithium carbonate from wastewater solution containing lithium and sodium recovered from ternary battery24 Sep 2026US 2026/0285699 A1Hebei Leheng Energy Saving Equipment Co., Ltd.
- Methods and systems for treating aqueous effluent27 Aug 2026US 2026/0250170 A1Gradiant Corporation
- Electro-activated super oxidized water and method of synthesizing the same25 Jun 2026US 2026/0176174 A1Bactiguard AB
- Freeze desalination method via injection of dry ice field16 Apr 2026US 2026/0103404 A1Prd Tech, Inc.
- Water treatment and desalination9 Apr 2026US 2026/0097972 A9Sylvan Source, Inc.
Most cited
By later US patents
- Process for sterilization and removal of inorganic salts from a water stream61US 4,392,959 A1983
- Desalination and concomitant carbon dioxide capture yielding liquid carbon dioxide55US 6,475,460 B1Marine Desalination Systems, L.L.C. · 2002
- System and method for storing energy and purifying fluid48US 8,931,277 B2State of Oregon acting by and through the State Board of Higher Education on behalf of Oregon State University · 2015
- Three phase separation process41US 5,167,838 A1992
- Atmospheric water extractor and method41US 5,857,344 A1999