C02F 1/58
Treatment of water, waste water, or sewage: by removing specified dissolved compounds
Official title: by removing specified dissolved compounds (using ion-exchange C02F1/42; softening water C02F5/00)
C02F1/58 (Treatment of water, waste water, or sewage: by removing specified dissolved compounds) appears on 680 US grants and 488 published applications in this corpus.
Search patents in C02F- Granted patents
- 680
- Published applications
- 488
- Assignees
- 515
- Inventors
- 1,634
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 7 | 0 |
| 1978 | 13 | 0 |
| 1979 | 8 | 0 |
| 1980 | 6 | 0 |
| 1981 | 14 | 0 |
| 1982 | 7 | 0 |
| 1983 | 6 | 0 |
| 1984 | 12 | 0 |
| 1985 | 8 | 0 |
| 1986 | 11 | 0 |
| 1987 | 9 | 0 |
| 1988 | 12 | 0 |
| 1989 | 10 | 0 |
| 1990 | 6 | 0 |
| 1991 | 12 | 0 |
| 1992 | 17 | 0 |
| 1993 | 13 | 0 |
| 1994 | 9 | 0 |
| 1995 | 18 | 0 |
| 1996 | 20 | 0 |
| 1997 | 21 | 0 |
| 1998 | 14 | 0 |
| 1999 | 23 | 0 |
| 2000 | 22 | 0 |
| 2001 | 18 | 5 |
| 2002 | 24 | 15 |
| 2003 | 14 | 10 |
| 2004 | 10 | 8 |
| 2005 | 7 | 10 |
| 2006 | 8 | 2 |
| 2007 | 8 | 3 |
| 2008 | 2 | 7 |
| 2009 | 3 | 4 |
| 2010 | 6 | 8 |
| 2011 | 2 | 8 |
| 2012 | 4 | 7 |
| 2013 | 4 | 27 |
| 2014 | 13 | 29 |
| 2015 | 12 | 13 |
| 2016 | 17 | 20 |
| 2017 | 24 | 28 |
| 2018 | 18 | 33 |
| 2019 | 25 | 29 |
| 2020 | 22 | 18 |
| 2021 | 16 | 40 |
| 2022 | 26 | 34 |
| 2023 | 19 | 45 |
| 2024 | 28 | 33 |
| 2025 | 27 | 40 |
| 2026 | 15 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Apparatus and methods for methyl mercury detection and capture22 Sep 2026US 12,741,891 B2The Regents of the University of California
- Recycling system4 Aug 2026US 12,698,223 B2BYD Company Limited
- System and method for low-temperature treatment of heavy metals and dioxins in fly ash7 Jul 2026US 12,673,352 B2Zhejiang University
- Process for recovering lithium from brines28 Apr 2026US 12,612,901 B2Terralithium LLC
- Water treatment method and water treatment apparatus21 Apr 2026US 12,606,467 B2Organo Corporation
- Additive combination for treatment of heavy metals and dioxins in fly ash1 Oct 2026US 2026/0295645 A1Zhejiang University
- Water treatment apparatus for decomposing perfluorinated compound on basis of vacuum ultraviolet rays24 Sep 2026US 2026/0285710 A1Seoul National University R&Db Foundation
- Method and Apparatus to Separate Per-and Polyfluoroalkyl Substances (PFAS) from Water Using Colloidal Gas Aphrons (CGAs)9 Jul 2026US 2026/0193114 A1Aphron Technologies, LLC
- Coated Single Crystalline Metal Oxide Materials and Method for Producing the Same9 Jul 2026US 2026/0196489 A1Action Battery Technologies, Inc.
- Bioremediation systems for wastewater treatment and methods for the use thereof7 May 2026US 2026/0125301 A1Cemvita Factory, Inc.
Most cited
By later US patents
- In-situ remediation system and method for contaminated groundwater121US 4,832,122 AThe United States of America as represented by the United States Department of Energy · 1989
- Process to stabilize bioorganic, raw or treated wastewater sludge89US 5,417,861 AN-Viro International Corporation · 1995
- Process for the treatment of metal-containing water and recovery of metals therefrom81US 5,505,857 ABoard of Regents of the University and Community College System of Nevada on behalf of the University of Nevada · 1996
- Method for lime stabilization of wastewater treatment plant sludges79US 4,306,978 AWillow Technology, Inc. · 1981
- Process to stabilize wastewater sludge75US 5,275,733 AN-Viro Energy Systems Ltd. · 1994