C02F 1/5281
Installations for water purification using chemical agents
Official title: {Installations for water purification using chemical agents}
C02F1/5281 (Installations for water purification using chemical agents) appears on 426 US grants and 343 published applications in this corpus.
Search patents in C02F- Granted patents
- 426
- Published applications
- 343
- Assignees
- 284
- Inventors
- 946
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 11 | 0 |
| 1977 | 11 | 0 |
| 1978 | 4 | 0 |
| 1979 | 15 | 0 |
| 1980 | 2 | 0 |
| 1981 | 13 | 0 |
| 1982 | 9 | 0 |
| 1983 | 7 | 0 |
| 1984 | 5 | 0 |
| 1985 | 4 | 0 |
| 1986 | 5 | 0 |
| 1987 | 8 | 0 |
| 1988 | 9 | 0 |
| 1989 | 8 | 0 |
| 1990 | 2 | 0 |
| 1991 | 4 | 0 |
| 1992 | 9 | 0 |
| 1993 | 4 | 0 |
| 1994 | 3 | 0 |
| 1995 | 5 | 0 |
| 1996 | 6 | 0 |
| 1997 | 6 | 0 |
| 1998 | 9 | 0 |
| 1999 | 6 | 0 |
| 2000 | 2 | 0 |
| 2001 | 12 | 1 |
| 2002 | 6 | 4 |
| 2003 | 3 | 2 |
| 2004 | 5 | 9 |
| 2005 | 6 | 4 |
| 2006 | 7 | 5 |
| 2007 | 6 | 5 |
| 2008 | 5 | 7 |
| 2009 | 4 | 9 |
| 2010 | 4 | 9 |
| 2011 | 11 | 9 |
| 2012 | 4 | 8 |
| 2013 | 7 | 13 |
| 2014 | 6 | 18 |
| 2015 | 8 | 30 |
| 2016 | 10 | 22 |
| 2017 | 14 | 21 |
| 2018 | 30 | 18 |
| 2019 | 17 | 25 |
| 2020 | 13 | 18 |
| 2021 | 17 | 29 |
| 2022 | 15 | 17 |
| 2023 | 19 | 16 |
| 2024 | 15 | 14 |
| 2025 | 12 | 16 |
| 2026 | 3 | 14 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Efficient nitrogen and phosphorus removal process system for mariculture tail water treatment15 Sep 2026US 12,735,339 B2Tianjin Research Institute for Water Transport Engineering, M.O.T.
- Flocculation cyclone device, marine plastic removal system using the same, ship provided with the system, and operation method for the ship16 Jun 2026US 12,654,179 B2Ambitious Technologies, LTD.
- Processes for removing perfluoroalkyl substances and regenerating an adsorbent used with same14 Apr 2026US 12,599,800 B2Uop LLC
- System and method for softening high-salinity water via self-induced calcium bicarbonate crystallization in fluidized bed30 Dec 2025US 12,509,374 B2Greentech Environment Co., Ltd.
- Household appliance with coagulant dosing system18 Nov 2025US 12,473,216 B2Whirlpool Corporation
- Wastewater treatment system and method of treating wastewater24 Sep 2026US 2026/0285727 A1Pegras Asia Pacific Pty Ltd
- Brine mineral precipitation extraction6 Aug 2026US 2026/0225006 A1NetZeroImpact LLC
- Processes for removing perfluoroalkyl substances and regenerating an adsorbent used with same30 Jul 2026US 2026/0216550 A1Uop LLC
- Countercurrent-cocurrent dissolved air flotation process system16 Jul 2026US 2026/0200762 A1Guangdong Ocean University
- Concrete wastewater treatment device and system16 Jul 2026US 2026/0200776 A1
Most cited
By later US patents
- Mobile waste water and sludge treatment for hazardous and non-hazardous fluids74US 4,536,286 AWater & Industrial Waste Laboratories, Inc. · 1985
- Process and apparatus for the chemical-mechanical treatment and purification of ground waters, surface waters and effluents69US 4,388,195 APassavant-Werke Michelbacher Hutte · 1983
- Process and apparatus for electrocoagulative treatment of industrial waste water63US 5,928,493 AKaspar Electroplating Corporation · 1999
- Method of applying ozone and sonic energy to sterilize and oxidize waste water62US 4,003,832 ATII Corporation · 1977
- Method for separating pollutants from liquid60US 4,246,102 ARederiaktiebolaget Nordstjernan · 1981